#include<stdio.h>

int main()

{

????int *pointer_1,*pointer_2;

????int a,b;

????pointer_1=&a;

????pointer_2=&b;

????printf("Please enter two numbers:\n");

????scanf("%d,%d",&a,&b);

????if(a<b)

????????swap(pointer_1,pointer_2);?

?? ?printf("%d,%d",a,b);

????return 0;

? }

?為什么?是? ?swap(pointer_1,pointer_2);?而不是swap(*pointer_1,*pointer_2);這樣不能交換a,b的兩個值嗎

void swap(int *p1,int *p2)

{

????int temp;

????temp=*p1;

????*p1=*p2;

????*p2=temp;

}