Question

怎么用指针法实现交换两个变量的值，并在主函数中调用？

Answer 1

#include <stdio.h>
void swap(int *p1,int *p2)
{ int t;
t=*p1; *p1=*p2; *p2=t; //交换p1和p2所指向的内容
}
void main()
{ int a,b;
int *pointer_1, *pointer_2;
printf("请输入两个数字:\n");
scanf("%d%d",&a,&b);
pointer_1=&a; pointer_2=&b;
swap(pointer_1,pointer_2); //函数调用，指针作为实参
printf("\n%d,%d\n",a,b);
}