file node bug fixed and add 3 exercises

data/1.C语言初阶/2.数据类型/3.基本数据类型/config.json

@@ -47,7 +47,8 @@
     }
   ],
   "export": [
-    "basic_data_types.json"
+    "basic_data_types.json",
+    "is_alphabet_or_not.json"
   ],
   "node_id": "c-4fd1baa5eb72451aa52e5ef801376f6f",
   "title": "基本数据类型"

data/1.C语言初阶/2.数据类型/3.基本数据类型/is_alphabet_or_not.c

+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    char ch;
+    printf("请输入一个字符：");
+    scanf("%c", &ch);
+
+    if (('a' <= ch <= 'z') || ('A' <= ch <= 'Z'))
+        printf("字符 \'%c\' 是一个英文字母", ch);
+    else
+        printf("字符 \'%c\' 不是一个英文字母", ch);
+
+    return 0;
+}
\ No newline at end of file

data/1.C语言初阶/2.数据类型/3.基本数据类型/is_alphabet_or_not.json

+{
+    "type": "code_options",
+    "author": "卢昕",
+    "source": "is_alphabet_or_not.md",
+    "exercise_id":"bf510b82ad534ae6ba501e6872888c21"
+}
\ No newline at end of file

data/1.C语言初阶/2.数据类型/3.基本数据类型/is_alphabet_or_not.md

+# 英文字母判断
+
+判断一个字符是否是英文字母。请选出错误答案。
+
+## 答案
+
+```c
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    char ch;
+    printf("请输入一个字符：");
+    scanf("%c", &ch);
+
+    if (('a' <= ch <= 'z') || ('A' <= ch <= 'Z'))
+        printf("字符 \'%c\' 是一个英文字母", ch);
+    else
+        printf("字符 \'%c\' 不是一个英文字母", ch);
+
+    return 0;
+}
+```
+
+## 选项
+
+### A
+
+```c
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    char ch;
+    printf("请输入一个字符：");
+    scanf("%c", &ch);
+
+    if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z'))
+        printf("字符 \'%c\' 是一个英文字母", ch);
+    else
+        printf("字符 \'%c\' 不是一个英文字母", ch);
+
+    return 0;
+}
+```
+
+### B
+
+```c
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    char ch;
+    printf("请输入一个字符：");
+    scanf("%c", &ch);
+
+    if ((ch >= 97 && ch <= 122) || (ch >= 65 && ch <= 90))
+        printf("字符 \'%c\' 是一个英文字母", ch);
+    else
+        printf("字符 \'%c\' 不是一个英文字母", ch);
+
+    return 0;
+}
+```
+
+### C
+
+```c
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    char ch;
+    printf("请输入一个字符：");
+    scanf("%c", &ch);
+
+    if ((0 <= (ch - 'a') && (ch - 'a') < 26) || (0 <= (ch - 'A') && (ch - 'A') < 26))
+        printf("字符 \'%c\' 是一个英文字母", ch);
+    else
+        printf("字符 \'%c\' 不是一个英文字母", ch);
+
+    return 0;
+}
+```

data/1.C语言初阶/3.运算符与表达式/2.算术运算符与表达式/config.json

@@ -80,7 +80,8 @@
     }
   ],
   "export": [
-    "arithmetic_op.json"
+    "arithmetic_op.json",
+    "count_num_of_digits.json"
   ],
   "node_id": "c-e985fb409a3a43798aa3103cebe813e3",
   "title": "算术运算符与表达式"

data/1.C语言初阶/3.运算符与表达式/2.算术运算符与表达式/count_num_of_digits.c

+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    int num, count = 0;
+
+    printf("请输入一个正整数：");
+    scanf("%d", &num);
+
+    while (num > 0)
+    {
+        num %= 10;
+        count++;
+    }
+
+    printf("位数为：%d", count);
+    return 0;
+}
\ No newline at end of file

data/1.C语言初阶/3.运算符与表达式/2.算术运算符与表达式/count_num_of_digits.json

+{
+    "type": "code_options",
+    "author": "卢昕",
+    "source": "count_num_of_digits.md",
+    "exercise_id":"6b79121e26224651ab01251676bb5458"
+}
\ No newline at end of file

data/1.C语言初阶/3.运算符与表达式/2.算术运算符与表达式/count_num_of_digits.md

+# 判断正整数的位数
+
+输入一个正整数，判断其一共包含多少位，请选出错误答案。
+
+## 答案
+
+```c
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    int num, count = 0;
+
+    printf("请输入一个正整数：");
+    scanf("%d", &num);
+
+    while (num > 0)
+    {
+        num %= 10;
+        count++;
+    }
+
+    printf("位数为：%d", count);
+    return 0;
+}
+```
+
+## 选项
+
+### A
+
+```c
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    int num, count = 0;
+
+    printf("请输入一个正整数：");
+    scanf("%d", &num);
+
+    while (num > 0)
+    {
+        num = num / 10;
+        count = count + 1;
+    }
+
+    printf("位数为：%d", count);
+    return 0;
+}
+```
+
+### B
+
+```c
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    int num, count = 0;
+
+    printf("请输入一个正整数：");
+    scanf("%d", &num);
+
+    while (num > 0)
+    {
+        num /= 10;
+        ++count;
+    }
+
+    printf("位数为：%d", count);
+    return 0;
+}
+```
+
+### C
+
+```c
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    int num, count = 0;
+
+    printf("请输入一个正整数：");
+    scanf("%d", &num);
+
+    while (num > 0)
+    {
+        num /= 10;
+        count += 1;
+    }
+
+    printf("位数为：%d", count);
+    return 0;
+}
+```

data/2.C语言中阶/1.函数与程序结构/5.函数的递归/config.json

@@ -8,7 +8,8 @@
   ],
   "children": [],
   "export": [
-    "recursion.json"
+    "recursion.json",
+    "loop_imitation.json"
   ],
   "title": "函数的递归"
 }
\ No newline at end of file

data/2.C语言中阶/1.函数与程序结构/5.函数的递归/loop_imitation.c

+#include <stdio.h>
+
+void print(int number);
+
+int main(int argc, char **argv)
+{
+    int num = 1;
+    print(num);
+
+    return 0;
+}
+
+void print(int number)
+{
+    if (number <= 100)
+    {
+        print(++number);
+        printf("%d\t", number);
+    }
+}
\ No newline at end of file

data/2.C语言中阶/1.函数与程序结构/5.函数的递归/loop_imitation.json

+{
+    "type": "code_options",
+    "author": "卢昕",
+    "source": "loop_imitation.md",
+    "exercise_id":"bb31a0a1d8d2423d95da3b0c3176507e"
+}
\ No newline at end of file

data/2.C语言中阶/1.函数与程序结构/5.函数的递归/loop_imitation.md

+# 模拟循环
+
+在不使用循环的情况下，使用递归按升序输出1到100的所有整数。请选出错误答案。
+
+## 答案
+
+```c
+#include <stdio.h>
+
+void print(int number);
+
+int main(int argc, char **argv)
+{
+    int num = 1;
+    print(num);
+
+    return 0;
+}
+
+void print(int number)
+{
+    if (number <= 100)
+    {
+        print(++number);
+        printf("%d\t", number);
+    }
+}
+```
+
+## 选项
+
+### A
+
+```c
+#include <stdio.h>
+
+void print(int number);
+
+int main(int argc, char **argv)
+{
+    int num = 1;
+    print(num);
+
+    return 0;
+}
+
+void print(int number)
+{
+    if (number <= 100)
+    {
+        printf("%d\t", number);
+        print(number + 1);
+    }
+}
+```
+
+### B
+
+```c
+#include <stdio.h>
+
+void print(int number);
+
+int main(int argc, char **argv)
+{
+    int num = 100;
+    print(num);
+
+    return 0;
+}
+
+void print(int number)
+{
+    if (number >= 1)
+    {
+        print(number - 1);
+        printf("%d\t", number);
+    }
+}
+```
+
+### C
+
+```c
+#include <stdio.h>
+
+void print(int *number);
+
+int main(int argc, char **argv)
+{
+    int num = 1;
+    print(&num);
+
+    return 0;
+}
+
+void print(int *number)
+{
+    if (*number <= 100)
+    {
+        printf("%d\t", *number);
+        ++(*number);
+        print(number);
+    }
+}
+```

data/3.C语言高阶/5.文件/1.文件的基本操作/config.json

 {
-  "node_id": "c-6ac7da2c6a894cc2ad4a2facb2aec07a",
-  "keywords": [
-    "文件",
-    "文件基本操作",
-    "C语言"
-  ],
-  "children": [
-    {
-      "文件指针": {
-        "keywords": [
-          "文件指针",
-          "文件"
-        ],
-        "children": [],
-        "node_id": "c-49b8b5358dd44f2683ad375c1ca322a6"
-      }
-    },
-    {
-      "文件的打开": {
-        "keywords": [
-          "文件的打开",
-          "文件",
-          "文件打开"
-        ],
-        "children": [],
-        "node_id": "c-413936e2468c4e319c798d4a524c52c5"
-      }
-    },
-    {
-      "文件的关闭": {
-        "keywords": [
-          "文件的关闭",
-          "文件",
-          "文件关闭"
-        ],
-        "children": [],
-        "node_id": "c-30566999b5104e54a258debe6b7e8a85"
-      }
-    }
-  ],
-  "export": [],
-  "title": "文件的基本操作"
+    "node_id": "c-6ac7da2c6a894cc2ad4a2facb2aec07a",
+    "keywords": [
+        "文件",
+        "文件基本操作",
+        "C语言"
+    ],
+    "children": [
+        {
+            "文件指针": {
+                "keywords": [
+                    "文件指针",
+                    "文件"
+                ],
+                "children": [],
+                "node_id": "c-49b8b5358dd44f2683ad375c1ca322a6"
+            }
+        },
+        {
+            "文件的打开": {
+                "keywords": [
+                    "文件的打开",
+                    "文件",
+                    "文件打开"
+                ],
+                "children": [],
+                "node_id": "c-413936e2468c4e319c798d4a524c52c5"
+            }
+        },
+        {
+            "文件的关闭": {
+                "keywords": [
+                    "文件的关闭",
+                    "文件",
+                    "文件关闭"
+                ],
+                "children": [],
+                "node_id": "c-30566999b5104e54a258debe6b7e8a85"
+            }
+        }
+    ],
+    "export": [
+        "file01.json",
+        "file02.json",
+        "file03.json"
+    ],
+    "title": "文件的基本操作"
 }
\ No newline at end of file