realloc示例

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int i;
    int*pn=(int*)malloc(5*sizeof(int));
    printf("malloc%d\n",pn);
    for(i=0;i<5;i++)
        pn[i]=i;
    pn=(int*)realloc(pn,10*sizeof(int));
    printf("realloc%d\n",pn);
    for(i=5;i<10;i++)
        pn[i]=i;
    for(i=0;i<10;i++)
        printf("%3d",pn[i]);
    free(pn);
    return 0;
}