指针实现交换两个数字的大小
2010-10-07 16:22:46 来源:WEB开发网核心提示:#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(s
#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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