合并提交

.vscode/launch.json

+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "g++.exe build and debug active file",
+      "type": "cppdbg",
+      "request": "launch",
+      "program": "${fileDirname}\\${fileBasenameNoExtension}.exe",
+      "args": [],
+      "stopAtEntry": false,
+      "cwd": "${workspaceFolder}",
+      "environment": [],
+      "externalConsole": false,
+      "MIMode": "gdb",
+      "miDebuggerPath": "C:\\mingw64\\bin\\gdb.exe",
+      "setupCommands": [
+        {
+          "description": "Enable pretty-printing for gdb",
+          "text": "-enable-pretty-printing",
+          "ignoreFailures": true
+        }
+      ],
+      "preLaunchTask": "g++.exe build active file",
+      "internalConsoleOptions": "neverOpen"
+    }
+  ]
+}
\ No newline at end of file

.vscode/settings.json

+{
+  "C_Cpp.default.intelliSenseMode": "gcc-x64",
+  "C_Cpp.default.compilerPath": "C:\\mingw64\\bin\\g++.exe",
+  "C_Cpp.default.cppStandard": "c++20",
+  "debug.onTaskErrors": "abort"
+}
\ No newline at end of file

.vscode/tasks.json

+{
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "type": "shell",
+      "label": "g++.exe build active file",
+      "command": "C:\\mingw64\\bin\\g++.exe",
+      "args": [
+        "-g",
+        "-std=c++20",
+        "\"${file}\"",
+        "-o",
+        "\"${fileDirname}\\${fileBasenameNoExtension}.exe\""
+      ],
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "presentation": {
+        "echo": false,
+        "reveal": "silent",
+        "focus": false,
+        "panel": "shared",
+        "showReuseMessage": false,
+        "clear": true
+      },
+      "problemMatcher": [
+        "$gcc"
+      ]
+    }
+  ],
+  "options": {
+    "shell": {
+      "executable": "${env:SystemRoot}\\System32\\cmd.exe",
+      "args": [
+        "/c"
+      ]
+    },
+    "env": {
+      "Path": "C:\\mingw64\\bin:${env:Path}"
+    }
+  }
+}
\ No newline at end of file

4_1.c

+#include <stdio.h>
+
+int main()
+{
+	int t;
+	double x, y;
+
+	t = scanf("%lf", &x);
+
+	while (t == 1)
+	{
+		if (x <= 2.5)
+			y = 1.5 * x + 7.5;
+		else
+			y = 9.32 * x - 34.2;
+
+		printf("y=%.2lf\n", y);
+
+		t = scanf("%lf", &x);
+
+	}
+
+}
\ No newline at end of file

4_10.c

+#include <stdio.h>
+
+int main()
+{
+	int a = 1, b = 1, t, i;
+	double sum = 0, p;
+	for (i = 1; i <= 20; i++)
+	{
+		p = 1.0 * b / a;
+		sum += p;
+		t = b;
+		b = a + b;
+		a = t;
+	}
+	printf("sum = %lf", sum);
+}
\ No newline at end of file

4_11.c

+#include <stdio.h>
+
+int main()
+{
+	int i, gws, sws, bws, qws, count = 0;
+	for (i = 1000; i < 10000; i++)
+	{
+		gws = i % 10;
+		sws = (i / 10) % 10;
+		bws = (i / 100) % 10;
+		qws = i / 1000;
+		if ((gws == qws) && (sws == bws))
+		{
+			printf("%d\t", i);
+			count += 1;
+			if (count % 6 == 0)
+				printf("\n");
+		}
+		
+	}
+	printf("count = %d", count);
+}
\ No newline at end of file

4_12.c

+#include <stdio.h>
+
+int main()
+{
+	int i, t, s, count = 0;
+	for (i = 1; i < 600; i++)
+	{
+		t = i;
+		do {
+			s = t % 10;
+			if (s == 5)
+				break;
+			t /= 10;
+		} while (t != 0);
+		if ((s == 5) && (i % 3 == 0))
+		{
+			printf("%d\t", i);
+			count += 1;
+			if (count % 8 == 0) printf("\n");
+		}
+	}
+	printf("count = %d", count);
+	
+	return 0;
+}
\ No newline at end of file

4_13_0.c

+#include <stdio.h>
+
+int main()
+{
+	int i, m, n;
+	scanf("%d,%d", &m, &n);
+	for (i = 1; i <= m; i++)
+	{
+		if (i == 1 || i == m)
+		{
+			int j;
+			for (j = 1; j <= n; j++)
+				printf("*");
+		}
+		else
+		{
+			int j;
+			for (j = 1; j <= n; j++)
+			{
+				if (j == 1 || j == n) printf("*");
+				else printf(" ");
+
+			}
+		}
+		printf("\n");
+	}
+}
\ No newline at end of file

4_13_1.c

+#include <stdio.h>
+
+int main()
+{
+	int i, j, m, n;
+	scanf("%d,%d", &m, &n);
+	for (i = 1; i <= m; i++)
+	{
+		for (j = 1; j <= n; j++)
+		{
+			if ((i == 1) || (i == m) || (j == 1) || (j == n))
+				printf("*");
+			else
+				printf(" ");
+		}
+		printf("\n");
+	}
+}
\ No newline at end of file

4_14_0.c

+#include <stdio.h>
+
+int main()
+{
+	int num, gws, sws, bws;
+	for (num = 100; num < 1000; num++)
+	{
+		gws = num % 10;
+		sws = (num / 10) % 10;
+		bws = num / 100;
+		if (num == gws * gws * gws + sws * sws * sws + bws * bws * bws)
+			printf("%d\t", num);
+	}
+}
\ No newline at end of file

4_14_1.c

+#include <stdio.h>
+
+int main()
+{
+	int a, b, c, i;
+	for (a = 1; a < 10; a++)
+	{
+		for (b = 0; b < 10; b++)
+		{
+			for (c = 0; c < 10; c++)
+			{
+				i = a * 100 + b * 10 + c;
+				if (i == a * a * a + b * b * b + c * c * c)
+					printf("%d\t", i);
+			}
+		}
+	}
+}
\ No newline at end of file

4_15.c

+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+	int n, i, j;
+	for (n = 90; n <= 100; n += 2)
+	{
+		for (i = 3; i <= n / 2; i += 2)
+		{
+			int k, p = 1;
+			for (k = 2; k <= sqrt(i); k++)
+			{
+				if (i % k == 0)
+				{
+					p = 0;
+					break;
+				}
+			}
+			if (p == 1)
+			{
+				j = n - i;
+				for (k = 2; k <= sqrt(j); k++)
+				{
+					if (j % k == 0)
+					{
+						p = 0;
+						break;
+					}
+				}
+				if (p == 1)
+					printf("%d = %d + %d\t", n, i, j);
+			}
+		}
+		printf("\n");
+	}
+}
\ No newline at end of file

4_2.c

+#include <stdio.h>
+
+int main()
+{
+	int x, y, z;
+	scanf("%d,%d,%d", &x, &y, &z);
+	if (x <= y && y <= z)
+		printf("%d,%d,%d", x, y, z);
+	else if (x <= z && z <= y)
+		printf("%d,%d,%d", x, z, y);
+	else if (x >= y && x <= z)
+		printf("%d,%d,%d", y, x, z);
+	else if (y <= z && z <= x)
+		printf("%d,%d,%d", y, z, x);
+	else if (z <= x && x <= y)
+		printf("%d,%d,%d", z, x, y);
+	else
+		printf("%d,%d,%d", z, y, x);
+	return 0;
+}
\ No newline at end of file

4_3.c

+#include <stdio.h>
+
+int main()
+{
+	double x, y;
+	scanf("%lf,%lf", &x, &y);
+	if (x > 0 && y > 0)
+		printf("1");
+	else if (x < 0 && y>0)
+		printf("2");
+	else if (x < 0 && y < 0)
+		printf("3");
+	else if (x > 0 && y < 0)
+		printf("4");
+	else
+		printf("5");
+	return 0;
+}
\ No newline at end of file

4_4.c

+#include <stdio.h>
+
+int main()
+{
+	char scare;
+	printf("ÇëĘäČëżźşËľČźśŁ¨A~EŁŠŁş");
+	scanf("%c", &scare);
+	if (scare == 'a' || scare == 'A')
+		printf("90~100");
+	else if (scare == 'b' || scare == 'B')
+		printf("80~89");
+	else if (scare == 'c' || scare == 'C')
+		printf("70~79");
+	else if (scare == 'd' || scare == 'D')
+		printf("60~69");
+	else if (scare == 'e' || scare == 'E')
+		printf("0~59");
+	else
+		printf("error");
+}
\ No newline at end of file

4_5.c

+#include <stdio.h>
+
+int main()
+{
+	char scare;
+	printf("ÇëĘäČëżźşËľČźśŁ¨A~EŁŠŁş\n");
+	scanf("%c", &scare);
+	switch (scare)
+	{
+	case 'a':printf("90~100"); break;
+	case 'A':printf("90~100"); break;
+	case 'b':printf("80~89"); break;
+	case 'B':printf("80~89"); break;
+	case 'c':printf("70~79"); break;
+	case 'C':printf("70~79"); break;
+	case 'd':printf("60~69"); break;
+	case 'D':printf("60~69"); break;
+	case 'e':printf("0~59"); break;
+	case 'E':printf("0~59"); break;
+		default:printf("error");
+	}
+	return 0;
+}
\ No newline at end of file

4_6.c

+#include <stdio.h>
+
+int main()
+{
+	int i, sum;
+	for (i = 1, sum = 0; i <= 100; i++)
+		if (i % 2 == 1)
+			sum += i;
+	printf("sum=%d", sum);
+	return 0;
+}
\ No newline at end of file

4_7.c

+#include <stdio.h>
+
+int main()
+{
+	int n,i,j;
+	double sum = 0, t;
+
+	printf("һ");
+	scanf("%d", &n);
+
+	for (i = 1; i <= n; i++)
+	{
+		t = 1;
+		for (j = 1; j<= i; j++)
+		{
+			t *= j;
+		}
+		sum += t;
+	}
+	printf("sum = %.2lf", sum);
+}
\ No newline at end of file

4_8.c

+#include <stdio.h>
+
+int main()
+{
+	int n, i, t;
+	double t1, t2, pi;
+	do {
+		printf("请输入一个整数：");
+		t = scanf("%d", &n);
+		pi = 1;
+		for (i = 1; i <= n; i++)
+		{
+			t1 = 2.0 * i / (2.0 * i - 1);
+			t2 = 2.0 * i / (2.0 * i + 1);
+			pi *= t1 * t2;
+		}
+		printf("PI的值为：%lf\n", 2 * pi);	
+	} while (t == 1);
+}
\ No newline at end of file

4_9.c

+#include <stdio.h>
+
+int main()
+{
+	double pi = 0, t = 0;
+	int i = 1, b = 1;
+	do{
+		pi += t * b;
+		if (i % 2 == 1)
+			b = 1;
+		else
+			b = -1;
+		t = 1.0 / (2.0 * i - 1);
+		i++;
+	} while (t >= 1.0e-6);
+	printf("PIֵΪ%lf", 4 * pi);
+	
+}
\ No newline at end of file

5_1.c

+#include <stdio.h>
+#include <math.h>
+
+int isPrime(int x)
+{
+	int i, p = 1;
+	for (i = 2; i <= sqrt(x); i++)
+	{
+		if (x % i == 0)
+		{
+			p = 0;
+			break;
+		}
+	}
+	return p;
+}
+
+int main()
+{
+	int i, count = 0;
+	for (i = 100; i <= 200; i++)
+	{
+		if (isPrime(i) == 1)
+		{
+			printf("%d\t", i);
+			count += 1;
+		}
+		if (count % 8 == 0 && count != 0)
+		{
+			printf("\n");
+		}		
+	}
+}
\ No newline at end of file

5_2.c

+#include <stdio.h>
+
+int fact(int x)
+{
+	int i, fact = 1;
+	for (i = 2; i <= x; i++)
+	{
+		fact *= i;
+	}
+	return fact;
+}
+
+int main()
+{
+	int i, n, sum = 0;
+	scanf("%d", &n);
+	for (i = 1; i <= n; i++)
+	{
+		sum += fact(i);
+	}
+	printf("sum = %d", sum);
+}
\ No newline at end of file

5_3.c

+#include <stdio.h>
+
+int fact(int x)
+{
+	if (x == 1) return 1;
+	else return fact(x - 1)*x;
+}
+
+int com(int m, int r)
+{
+	return fact(m) / (fact(r) * fact(m - r));
+}
+int main()
+{
+	int m, r, i;
+	for (i = 1; i <= 3; i++)
+	{
+		scanf("%d,%d", &m, &r);
+		printf("%d\n", com(m, r));
+	}
+	return 0;
+}

5_4.c

+#include <stdio.h>
+
+int gcd(int x, int y)
+{
+	return (x % y == 0) ? y : gcd(y, x % y);
+}
+
+int main()
+{
+	int i, j;
+	scanf("%d,%d", &i, &j);
+	printf("%d\n", gcd(i, j));
+}
\ No newline at end of file

5_5.c

+#include <stdio.h>
+
+double hermite(int n, double x)
+{
+	if (n == 0) return 1;
+	else if (n == 1) return 2 * x;
+	else
+		return 2.0 * x * hermite(n - 1, x) - 2.0 * (n - 1) * hermite(n - 2, x);
+}
+
+int main()
+{
+	int n, i;
+	double x;
+	scanf("%d,%lf", &n, &x);
+	for (i = 0; i <= n; i++)
+	{
+		printf("H(%d, %lf) = %.2lf\n", i, x, hermite(i, x));
+	}
+	return 0;
+}
\ No newline at end of file

5_6_0.c

+#include <stdio.h>
+
+void printTriangle(int n)
+{
+	int i,j;
+	for (i = 1; i <= n; i++)
+	{
+		if (i - 1 != 0)
+		{
+			for (j = 1; j <= i - 1; j++) printf(" \t");
+		}
+		for (j = 1; j <= n - i + 1; j++) printf("*\t");
+		printf("\n");
+	}
+}
+
+int main()
+{
+	int n;
+	scanf("%d", &n);
+	printTriangle(n);
+	return 0;
+}
\ No newline at end of file

5_6_1.c

+#include <stdio.h>
+
+void printTriangle(int n)
+{
+	int i, j;
+	for (i = 1; i <= n; i++)
+	{
+		for (j = 1; j <= n; j++)
+		{
+			if (i > j) printf(" \t");
+			else printf("*\t");
+		}
+		printf("\n");
+	}
+}
+
+int main()
+{
+	int n;
+	scanf("%d", &n);
+	printTriangle(n);
+	return 0;
+}
\ No newline at end of file

5_7.c

+#include <stdio.h>
+
+void pr_rev(int x)
+{
+	if (x / 10 == 0) printf("%d", x);
+	else
+	{
+		printf("%d", x % 10);
+		pr_rev(x / 10);
+	}
+}
+
+int main()
+{
+	int x;
+	scanf("%d", &x);
+	pr_rev(x);
+	return 0;
+}
\ No newline at end of file

5_8.1.c

+#include <stdio.h>
+
+int fact(int);
+
+int main()
+{
+	int i, n, sum = 0;
+	scanf("%d", &n);
+	for (i = 1; i <= n; i++)
+	{
+		sum += fact(i);
+	}
+	printf("sum = %d", sum);
+}
\ No newline at end of file

5_8.2.c

+int fact(int x)
+{
+	int i, fact = 1;
+	for (i = 2; i <= x; i++)
+	{
+		fact *= i;
+	}
+	return fact;
+}
\ No newline at end of file

6_1.c

+#include <stdio.h>
+#include "6_1_h.h"
+
+int main()
+{
+	int x,y;
+	scanf("%d,%d",&x,&y);
+	printf("%d",pow(x,y));
+}

6_1_h.h

+int pow(int x,int y)
+{
+	int i,t=1;
+	for(i=1;i<=y;i++)
+	{
+		t*=x;
+	}
+	return t;
+}
\ No newline at end of file

6_2.c

+#include <stdio.h>
+#include <math.h>
+
+#define square(x) (x)*(x)
+#define distance(x1,y1,x2,y2) sqrt(square(x1-x2)+square(y1-y2))
+
+int main()
+{
+	double x1,y1,x2,y2;
+	scanf("%lf,%lf,%lf,%lf",&x1,&y1,&x2,&y2);
+	printf("%.2lf",distance(x1,y1,x2,y2));
+}
\ No newline at end of file

6_3.c

+#include <stdio.h>
+#include <math.h>
+
+double square(int x)
+{
+	return 1.0*x*x;
+}
+
+double distance(int x1,int y1,int x2,int y2)
+{
+	return sqrt(square(x1-x2)+square(y1-y2));
+}
+
+int main()
+{
+	int x1,x2,y1,y2;
+	scanf("%d,%d,%d,%d",&x1,&y1,&x2,&y2);
+	printf("%.2lf",distance(x1,y1,x2,y2));
+	return 0;
+}
\ No newline at end of file

6_4.c

+#include <stdio.h>
+
+#define min2(x,y) (x)<=y?(x):y
+#define MIN4(w,x,y,z) min2(min2(min2(w,x),y),z)
+int main()
+{
+	int w,x,y,z;
+	scanf("%d,%d,%d,%d",&w,&x,&y,&z);
+	printf("%d",MIN4(w,x,y,z));
+	return 0;
+}
\ No newline at end of file

7_1.c

+#include <stdio.h>
+
+int main()
+{
+	int i,f[20]={1,1},sum=f[0]+f[1];
+	for(i=2;i<20;i++)
+	{
+		f[i]=f[i-2]+f[i-1];
+		sum+=f[i];
+	}
+	for(i=0;i<20;i++)
+	{
+		printf("%d\t",f[i]);
+		if((i+1)%5==0) printf("\n");
+	}
+	printf("sum=%d\n",sum);
+	return 0;
+}

7_11.c

+#include <stdio.h>
+
+int main()
+{
+	int i,count1=0,count2=0,count3=0,count4=0,count5=0;
+	char s[30];
+	gets(s);
+	for(i=0;s[i]!=0;i++)
+	{
+		if(s[i]>=65&&s[i]<=90) count1++;
+		else if(s[i]>=97&&s[i]<=122) count2++;
+		else if(s[i]>=48&&s[i]<=57) count3++;
+		else if(s[i]==32) count4++;
+		else count5++;
+	}
+	printf("%d,%d,%d,%d,%d",count1,count2,count3,count4,count5);
+}
\ No newline at end of file

7_12.c

+#include <stdio.h>
+
+
+void interCross(char s1[], char s2[], char s3[])
+{
+	int i,j;
+	for(i=0,j=0;(s1[i]!=0)&&(s2[i]!=0);j++)
+	{
+		if (j % 2 == 0) s3[j] = s1[i];
+		else {
+				s3[j] = s2[i];
+				i++;
+		}
+	}
+	if (s1[i] == 0)
+		for (; s2[i] != 0; j++, i++) s3[j] = s2[i];
+	if (s2[i] == 0)
+		for (; s1[i] != 0; j++, i++) s3[j] = s1[i];
+	s3[j] = 0;
+}
+int main()
+{
+	char s1[20], s2[20], s3[50];
+	scanf("%s", s1);
+	scanf("%s", s2);
+	interCross(s1, s2, s3);
+	printf("s1=%s,s2=%s\n", s1, s2);
+	printf("s3=%s", s3);
+}

7_13.c

+#include <stdio.h>
+
+void my_strcpy(char s1[], char s2[])
+{
+	int i;
+	for(i=0;s2[i]!=0;i++) s1[i]=s2[i];
+	s1[i]=0;
+}
+
+int main()
+{
+	char s1[20],s2[20];
+	printf("please input s2:\n");
+	scanf("%s",s2);
+	printf("s2=%s\n",s2);
+	my_strcpy(s1,s2);
+	printf("s1=%s",s1);
+}

7_14.c

+#include <stdio.h>
+
+void reverse(char s[])
+{
+	int i,n;
+	for(i=0;s[i]!=0;i++);
+	n=i;
+	for(i=0;s[i]!=0;i++)
+	{
+		char t;
+		if(i>=n-i-1) break;
+		t=s[i];
+		s[i]=s[n-i-1];
+		s[n-i-1]=t;
+	}
+}
+
+int main()
+{
+	char s[20]; 
+	scanf("%s",s);
+	printf("%s\n",s);
+	reverse(s);
+	printf("%s",s);
+}
\ No newline at end of file

7_2.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#define n 10000
+int main()
+{
+	int a[10000],i,p=0,q=0;
+	double randnumber;
+
+	srand(time(NULL));
+	for(i=0;i<n;i++)
+	{
+		randnumber=rand();
+		a[i]=(int)randnumber%10+1;
+		if(a[i]>=1&&a[i]<=5) p++;
+		else q++;
+	}
+	printf("1~5 %d,%.2lf%%\n",p,100.0*p/n);
+	printf("6~10 %d,%.2lf%%\n",q,100.0*q/n);
+
+}
\ No newline at end of file

7_3.c

+#include <stdio.h>
+#include <math.h>
+
+void input(int a[],int n)
+{
+	int i=0;
+	for(;i<n;i++)
+	{
+		scanf("%d",&a[i]);
+	}
+}
+
+double aver(int a[],int n)
+{
+	double sum=0;
+	int i;
+	for(i=0;i<n;i++)
+	{
+		sum+=a[i];
+	}
+	return sum/n;
+}
+
+double stddev(int a[],int n)
+{
+	double x=0;
+	int i;
+	for(i=0;i<n;i++)
+	{
+		x+=(a[i]-aver(a,n))*(a[i]-aver(a,n));
+	}
+	return sqrt(x/n);
+}
+
+int main()
+{
+	int a[100],n;
+	printf("ÇëÊäÈënµÄÖµ£¨n<=100£©:\n");
+	scanf("%d",&n);
+	input(a,n);
+	printf("%lf",stddev(a,n));
+}

7_4.c

+#include <stdio.h>
+
+#define N 6
+
+void bubble_sort(int a[],int n)
+{
+	int i,j,t;
+
+	for(i=0;i<n-1;i++)
+		for(j=0;j<n-1-i;j++)
+			if(a[j]>a[j+1])
+			{
+				t=a[j];a[j]=a[j+1];a[j+1]=t;
+			}
+}
+
+int main()
+{
+	int a[N],i;
+
+	printf("Please input %d number:\n",N);
+	for(i=0;i<N;i++)
+		scanf("%d",&a[i]);
+	bubble_sort(a,N);
+	printf("sorted:\n");
+	for(i=0;i<N;i++) printf("%d\t",a[i]);
+	printf("\n");
+	return 0;
+}

7_5.c

+#include <stdio.h>
+#define N 6
+
+void select_sort(int a[],int n)
+{
+	int i,j,p,t;
+	for(i=0;i<n-1;i++)
+	{
+		p=i;
+		for(j=i+1;j<n;j++)
+			if(a[j]<a[p]) p=j;
+		if(p!=i)
+		{	t=a[p];a[p]=a[i];a[i]=t;}
+	}
+}
+
+int main()
+{
+	int a[N],i;
+	printf("Please input %d numbers:\n",N);
+	for(i=0;i<N;i++)
+		scanf("%d",&a[i]);
+	select_sort(a,N);
+	printf("sorted:\n");
+	for(i=0;i<N;i++) printf("%d\t",a[i]);
+	printf("\n");
+	return 0;
+}

7_6.c

+#include <stdio.h>
+
+int gcd(int x,int y)
+{
+	return (x%y==0)?y:gcd(y,x%y);
+}
+int main()
+{
+	int a[8]={24, 1007, 956, 705, 574, 371, 416, 35}; 
+	int b[8]={60, 631,772, 201, 262, 763, 1000, 77};
+	int c[8],i;
+	for(i=0;i<8;i++) c[i]=gcd(a[i],b[i]);
+	for(i=0;i<8;i++) printf("%d\t",c[i]);
+	return 0;
+}
\ No newline at end of file

7_7.c

+#include <stdio.h>
+
+void output(int a[], int n)
+{
+	int i;
+	for (i = 0; i < n; i++) printf("%d\t", a[i]);
+	printf("\n");
+}
+
+int deleteElement(int a[], int n, int x)
+{
+	int i, j;
+	for (i = 0, j = 0; i < n; i++)
+	{
+		if (a[i] != x)
+		{
+			a[j] = a[i];
+			j++;
+		}
+	}
+	return j;
+}
+
+int main()
+{
+	int a[8] = { 1,2,3,4,5,6,5,4 }, x, t;
+
+	output(a, 8);
+
+	printf("Please input x:\n");
+	scanf("%d", &x);
+
+	t = deleteElement(a, 8, x);
+
+	output(a, t);
+}
\ No newline at end of file

7_8.c

+#include <stdio.h>
+
+int getbits(int n)
+{
+	int i,p=1;
+	for (i = 0; n / p != 0; i++, p *= 10);
+	return i;
+}
+
+void split(int a[], int n, int k)
+{
+	int i;
+	for (i = 0; i < k; i++, n /= 10) a[i] = n % 10;
+}
+
+void sorted(int a[], int k)
+{
+	int i, j, t;
+
+	for (i = 0; i < k - 1; i++)
+		for (j = 0; j < k - 1 - i; j++)
+			if (a[j] < a[j + 1])
+			{
+				t = a[j]; a[j] = a[j + 1]; a[j + 1] = t;
+			}
+
+}
+
+void reverse(int a[], int k)
+{
+	int i = 0;
+	for (i = 0; i < k/2; i++)
+	{
+		int t;
+		t = a[i];
+		a[i] = a[k - i - 1];
+		a[k - i - 1] = t;
+	}
+}
+
+int combine(int a[], int k)
+{
+	int t=0,i=0;
+	for(;i<k;i++)
+	{
+		t=t*10+a[i];
+	}
+	return t;
+}
+
+int main()
+{
+	int oldn =-1,n,a[5],k,n1,n2;
+	printf("任意输入一个四位或三位数n，注意各位数字不能相同；\n");
+	scanf("%d",&n);
+	k=getbits(n);
+	while(oldn!=n)
+	{
+		oldn=n;
+		split(a,n,k);
+		sorted(a,k);
+		n1=combine(a,k);
+		reverse(a,k);
+		n2=combine(a,k);
+		n=n1-n2;
+		printf("%d-%d=%d\n",n1,n2,n);
+	}
+	return 0;
+}
\ No newline at end of file

8_1.c

+#include <stdio.h>
+#include <math.h>
+
+struct Point
+{
+	double x, y;
+
+};
+struct Point Input()
+{
+	struct Point point;
+	printf("请输入一个坐标点的值：\n");
+	scanf("%lf,%lf", &point.x, &point.y);
+	return point;
+}
+void Output(struct Point p)
+{
+	printf("(%lf,%lf)\n", p.x, p.y);
+}
+double Distance(struct Point p1, struct Point p2)
+{
+	double dte = sqrt(pow((p1.x - p2.x), 2) + pow((p1.y - p2.y), 2));
+	return dte;
+}
+
+int main()
+{
+	struct Point p1, p2;
+	p1 = Input();
+	p2 = Input();
+	Output(p1);
+	Output(p2);
+	printf("%lf\n", Distance(p1, p2));
+	return 0;
+}

8_2.c

+#include <stdio.h>
+
+struct book
+{
+	char bookID[20];
+	char name[20];
+	double price;
+
+};
+void input(struct book bs[], int n)
+{
+	int i;
+	for (i = 0; i < n; i++)
+	{
+		printf("???????%d???????\n", i+1);
+		scanf("%lf", &bs[i].price);
+	}
+}
+double average(struct book bs[], int n)
+{
+	int i, sum = 0;
+	for (i = 0; i < n; i++) sum += bs[i].price;
+	return 1.0*sum/n;
+}
+int findMax(struct book bs[], int n)
+{
+	int i, k = 0, minn;
+	for (i = 0; i < n; i++)
+	{
+		minn = bs[0].price;
+		if (bs[i].price > minn) k = i;
+	}
+	return k;
+}
+void print(struct book bs[], int n)
+{
+	int i;
+	printf("???\t????\t\t???\n");
+	printf("---------------------------\n");
+	for (i = 0; i < n; i++) printf("%s\t%s\t%.2lf\n", bs[i].bookID, bs[i].name, bs[i].price);
+}
+void sort(struct book bs[],int n)
+{
+	int i, j;
+	for(i=0;i<n-1;i++)
+		for(j=0;j<n-1-i;j++)
+			if (bs[j].price > bs[j + 1].price)
+			{
+				double t;
+				t = bs[j + 1].price;
+				bs[j + 1].price = bs[j].price;
+				bs[j].price = t;
+
+			}
+}
+int main()
+{
+	struct book bs[4];
+	int i, t;
+	for (i = 0; i < 4; i++)
+	{
+		printf("???????%d?????????\n",i+1);
+		scanf("%s", &bs[i].bookID);
+		printf("???????%d???????????\n",i+1);
+		scanf("%s", &bs[i].name);
+	}
+	input(bs, 4);
+	printf("\n");
+	print(bs, 4);
+	printf("?????????\n");
+	printf("%lf\n",average(bs, 4));
+	t = findMax(bs, 4);
+	printf("????????????\n");
+	printf("%s\t%s\t%lf\n", bs[t].bookID, bs[t].name, bs[t].price);
+	sort(bs, 4);
+	print(bs, 4);
+}

8_3.c

+#include <stdio.h>
+
+enum color {RED,GREEN,BLUE};
+
+void print(enum color c)
+{
+	switch (c)
+	{
+	case RED:printf("red\t"); break;
+	case GREEN:printf("green\t"); break;
+	case BLUE:printf("blue\t"); break;
+	}
+}
+int main()
+{
+	enum color i, j, k;
+	int count = 0;
+	for (i = RED; i <= BLUE; i = (enum color)((int)i + 1))
+		for (j = RED; j <= BLUE; j = (enum color)((int)j + 1))
+			for (k = RED; k <= BLUE; k = (enum color)((int)k + 1))
+				if ((i != j) && (k != j) && (k != i))
+				{
+					printf("%d\t", ++count);
+					print(i);
+					print(j);
+					print(k);
+					printf("\n");
+				}
+	printf("combination:%d\n", count);
+	return 0;
+}

9_1.c

+#include <stdio.h>
+#include <string.h>
+
+void swap(char *s1,char *s2)
+{
+	char s3[20];
+	strcpy(s3, s2);
+	strcpy(s2, s1);
+	strcpy(s1, s3);
+}
+int main()
+{
+	char str1[20],str2[20],str3[20];
+	scanf("%s",str1);
+	scanf("%s",str2);
+	scanf("%s",str3);
+	if(strcmp(str1,str2)>0)
+		swap(str1,str2);
+	if(strcmp(str1,str3)>0)
+		swap(str1,str3);
+	if(strcmp(str2,str3)>0)
+		swap(str2,str3);
+	printf("%s\t%s\t%s",str1,str2,str3);
+	return 0;
+}
\ No newline at end of file

9_2.c

+#include <stdio.h>
+
+void getDigits(char *s1, char *s2)
+{
+	int i,j;
+	char *p = s1,*s = s2;
+	while(*p != 0)
+	{
+		if(*p >= 48&&*p<=57)
+			*s++ = *p++;
+		else *p++;
+	}
+	*s = 0;
+}
+int main()
+{
+	char s1[20],s2[20];
+	scanf("%s",s1);
+	getDigits(s1,s2);
+	printf("%s",s2);
+	return 0;
+}

9_3.c

+#include <stdio.h>
+
+int isLetter(char c)
+{
+	if((c>=65&&c<=90)||(c>=97&&c<=122))
+		return 1;
+	else return 0;
+}
+char toUpper(char c)
+{
+	if(c >= 65&&c<=90)
+		return c;
+	else
+	{
+		int  s = c - 32;
+		return s;
+	}
+}
+void firstUpper(char *s)
+{
+	char *p = s;
+	int count = 0;
+	while(*p!=0)
+	{
+		if(isLetter(*p)&&(count == 0))
+		{
+			*p = toUpper(*p);
+			*p++;
+			count = 1;
+		}
+		if(!isLetter(*p++))
+			count = 0;
+	}
+}
+int main()
+{
+	char s[] = "there are five apples in the basket";
+	firstUpper(s);
+	printf("%s",s);
+}

9_4.c

+#include <stdio.h>
+#include <string.h>
+void filter(char *a)
+{
+	char p[100];
+	int i, j = 0;
+	for (i = 0; i < 100; i++)
+	{
+		if (a[i] >= 65 && a[i] <= 90)
+			p[j++] = a[i];
+		if (a[i] >= 97 && a[i] <= 122)
+			p[j++] = a[i] - 32;
+	}
+	p[j] = 0;
+	for (i = 0; i < 100; i++)
+		a[i] = p[i];
+}
+int palin(char *a)
+{
+	char b[100];
+	filter(b);
+	char* head = b, * tail = b;
+	int count = 1;
+	for (int i = 0; b[i] != 0; i++)
+		tail++;
+	while (head < tail)
+	{
+		if (*head++ != *tail++) {
+			break;
+			count = 0;
+		}
+	}
+	return count;
+}
+int main()
+{
+	char a[100];
+	scanf("%s", a);
+	if (palin(a)) printf("yes");
+	else printf("no");
+}
\ No newline at end of file

OJ_1.c

+#include <stdio.h>
+
+int compare(int i)
+{
+    int count_1=0,count_0=0;
+    while(i!=0)
+    {
+        if (i%2==0) count_0++;
+        else count_1++;
+        i/=2;
+    }
+    return count_1 > count_0? 1: 0;
+}
+int main()
+{
+    int i,a=0,b=0;
+    for(i=1;i<=1000;i++)
+    {
+        if(compare(i)==1) a++;
+        else b++;
+    }
+    printf("%d %d",a,b);
+    return 0;
+}
\ No newline at end of file

OJ_2.c

+#include <stdio.h>
+
+int Fibonacci(int n)
+{
+    return n==1||n==2?1:Fibonacci(n-1)+Fibonacci(n-2);
+}
+int getupSecond(int a,int n,int m)
+{
+    return (m - a - Fibonacci(n - 3)*a)/(Fibonacci(n - 2) - 1);
+}
+int main()
+{
+   int a,n,m,x;
+   int onTrian,upSecond;
+
+   scanf("%d %d %d %d",&a,&n,&m,&x);
+
+   upSecond = getupSecond(a,n,m);
+   onTrian = a + Fibonacci(x-2)*a + Fibonacci(x-1)*upSecond - upSecond;
+
+   printf("%d",onTrian);
+
+   return 0;
+}
\ No newline at end of file

OJ_3.c

+#include <stdio.h>
+#include <stdbool.h>
+int main()
+{
+    float d1, c, d2, p;
+    int n, i, j;
+    scanf("%f %f %f %f %d", &d1, &c, &d2, &p, &n);
+    float pri[n+2];
+    float dis[n+2];
+    float nowOil=0.0;
+    float maxdis;
+    int min;
+    bool flag = false,is = false; 
+    pri[0] = p;
+    dis[0] = 0;
+    dis[n+1] = d1;
+    pri[n+1] = 0; 
+    float fpri = 0;
+    for(i = 1; i <= n; i++)
+    {
+        scanf("%f %f",&dis[i], &pri[i]);
+    }
+    for(i = 1; i <= n; i++)
+    {
+        for(j = i; j <= n; j++)
+        {
+            if(dis[i] > dis[j])
+            {
+                float td = pri[i];
+                pri[i] = pri[j];
+                pri[j] = td;
+                p = dis[i];
+                dis[i] = dis[j];
+                dis[j] = p;
+            }
+        }
+    }
+    i = 0;
+    j = 0;
+    while(1)
+    {
+        if(i >= n+1)
+        {
+            is = true;
+            break;
+        }
+        maxdis = dis[i] + c * d2;
+        if(maxdis < dis[i+1])
+        {
+            is = false;
+            break;
+        }
+        flag = false;
+        min = i+1; 
+        for(j = i+1; j < n+2; j++)
+        {
+            if(maxdis < dis[j])
+            {
+                break;
+            }
+            if(pri[j] <= pri[min] && j < n+1)
+            {
+                if(pri[j] != pri[min])
+                    min = j;
+                if(pri[min] <= pri[i])
+                {
+                    flag = true;
+                    break;
+                }
+            }
+        }
+        if(flag)
+        {
+            fpri += (dis[min] - dis[i] - nowOil*d2) / d2 * pri[i];
+            nowOil += (dis[min] - dis[i]) / d2;
+            nowOil -= (dis[min]-dis[i])/d2;
+            i = min;
+            nowOil -= (dis[min]-dis[i])/d2;
+            i = min;
+        }
+        else
+        {
+            if(j >= n+2)
+            {
+                fpri = fpri + (dis[n+1] - dis[i] - nowOil*d2) / d2 * pri[i];
+                nowOil += (dis[j] - dis[i]) / d2;
+                i = j;
+            }
+            else
+            {
+                fpri += (c-nowOil)*pri[i];
+                nowOil = c;
+                nowOil -= (dis[min]-dis[i])/d2;
+                i = min;
+            }
+        }
+
+    }
+    
+    if(!is)
+    {
+        printf("No Solution");
+    }
+    else
+    {
+        fpri = ((int)(100*fpri + 0.5))/100.0;
+        printf("%.2f", fpri);
+    }
+    return 0;
+}
\ No newline at end of file

OJ_7.c

+#include <stdio.h>
+
+int main()
+{
+    int a[100], n,b[100];
+    int p;
+    scanf("%d",&n);
+    for(int i = 0; i < n; i++)
+    {
+        scanf("%d",&a[i]);
+    }
+    scanf("%d",&p);
+    for(int i = 0; i < n-1; i++)
+        for(int j = 0;j<n-i-1; j++)
+            if(a[j]<a[j+1])
+            {
+                int t = 0;
+                t = a[j];
+                a[j] = a[j+1];
+                a[j+1] = t;
+            }
+    b[0] = a[0];
+    for(int i = 1, j = 1;i<n;i++)
+    {
+        if(a[i] == a[i-1]) continue;
+        else {b[j] = a[i];j++;}
+    }
+    for(int i = 0;i < n;i++)
+    {
+        if(p == b[i]) printf("%d",i+1);
+    }
+    return 0;
+}
\ No newline at end of file

helloworld.cpp

+// VS Code C++ 测试代码 "Hello World"
+// 由 VSCodeConfigHelper 生成
+
+// 您可以在当前的文件夹（您第一步输入的文件夹）下编写代码。
+
+// 按下 F5（部分设备上可能是 Fn + F5）编译调试。
+// 按下 Ctrl + Shift + B 编译，但不运行。
+// 按下 Ctrl + F5（部分设备上可能是 Ctrl + Fn + F5）编译运行，但不调试。
+
+#include <iostream>
+
+/**
+ * 程序执行的入口点。
+ */
+int main() {
+    // 在标准输出中打印 "Hello, world!"
+    std::cout << "Hello, world!" << std::endl;
+}
+
+// 此文件编译运行将输出 "Hello, world!"。
+// 按下 F5 后，您将在下方弹出的终端（Terminal）窗口中看到这一行字。
+
+// ** 重要提示：您以后编写其它代码时，请务必确保文件名不包含中文和特殊字符，切记！**
+
+// 如果遇到了问题，请您浏览
+// https://github.com/Guyutongxue/VSCodeConfigHelper/blob/master/TroubleShooting.md 
+// 获取帮助。如果问题未能得到解决，请联系开发者。
\ No newline at end of file