【C语言】使用指针实现交换变量值

/* * 使用指针实现交换变量值的函数swap()，同时编写不使用指针交换失败的函数做对比。 * */ #include <stdio.h> void swap(int a, int b) { printf("in swap() a = %d, b = %d\n", a, b); int tmp = a; a = b; b = tmp; printf("in swap() a = %d, b = %d\n", a, b); } void swap1(int *a, int *b) { printf("in swap1() *a = %d, *b = %d\n", *a, *b); int tmp = *a; *a = *b; *b = tmp; printf("in swap1() *a = %d, *b = %d\n", *a, *b); } int main() { int x = 10, y = 20; printf("in main() x = %d, y = %d\n", x, y); swap(x, y); printf("in main() x = %d, y = %d\n", x, y); swap1(&x, &y); printf("in main() x = %d, y = %d\n", x, y); return 0; }