#include <stdio.h> void exchange(int* p_m, int* p_n) { int tmp = 0; tmp = *p_m; *p_m = *p_n; *p_n = tmp; } int main() { int m = 0; int n = 0; scanf("%d%d", &m, &n); exchange(&m,&n); printf("%d %d", m, n); } 第一:定义两个变量m,n。第二...