交换两个整数的一些方法

交换两个数的值 5-17.c

+#include<stdio.h>
+//写成函数
+//void swap(long double* x, long double* y)
+//{
+//	long double temp = *x;
+//	*x = *y;
+//	*y = temp;
+//	return 0;
+//}
+//int main()
+//{
+//	long double a = 0, b = 0;
+//	printf("请输入两个数\n");
+//	scanf("%Lf%Lf", &a, &b);
+//	swap(&a,&b);
+//	printf("交换后：\n");
+//	printf("%.5f %.5f", a, b);
+//	return 0;
+//}
+// 传统方法
+//int main() {
+//	int a = 0, b = 0;
+//	printf("请输入两个整数：\n");
+//	scanf("%d%d", &a, &b);
+//	int tep = 0;
+//	tep = a;
+//	a=b;
+//	b = tep;
+//	printf("交换后为：%d %d", a, b);
+//	return 0;
+//}
+// 
+// 
+//可能溢出：
+//int main() {
+//	int a = 0, b = 0;
+//	printf("输入两个整数：\n");
+//	scanf("%d%d", &a, &b);
+//	a = a + b;
+//	b = a - b;
+//	a = a - b;
+//	printf("交换后：%d %d", a, b);
+//	return 0;
+//}
+//可读性差：
+int main() {
+	int a = 0, b = 0;
+	printf("请输入两个整数：\n");
+	scanf("%d%d", &a, &b);
+	a = a ^ b;
+	b = a ^ b;
+	a = a ^ b;
+	printf("交换后：%d %d", a, b);
+	return 0;
+}