指针实现交换两个数字的大小
2009-05-20 08:28:00 来源:WEB开发网#include <stdlib.h>
#include <stdio.h>
void swap(int *x,int *y)
{
int tmp;
tmp = *x;
*x = *y;
*y = tmp;
}
int main(void)
{
int *x,*y;
x = (int *)malloc(sizeof(int));
y = (int *)malloc(sizeof(int));
/*check if malloc is successful*/
if(x == NULL || y == NULL)
{
return -1;
}
else
{
printf("The address x pointed to is %d\n",x);
printf("The address y pointed to is %d\n",y);
*x = 1;
*y = 2;
swap(x,y);/*call function*/
printf("The address x pointed to is %d\n",x);
printf("The address y pointed to is %d\n",y);
printf("x is %d \n",*x);
printf("y is %d \n",*y);
free(x);
free(y);
x = NULL;
y = NULL;
int a = 100;
int b = 200;
swap(&a,&b);/*call function*/
printf("a is now %d.\n",a);
printf("b is now %d.\n",b);
return 0;
}
}
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