int型动态数组

创建动态数组，里面存放键盘输入的数字，回车键确定输入，-1为退出条件。

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main(void)
{
    int count = 0;
    int *p = NULL;
    int *prev = NULL;
    int new;
    int i;

    while (1) {
        printf("input number \n");
        scanf("%d", &new);

        if (-1 == new)
            break;

        prev = p;
        p = (int *)malloc(sizeof(int) * (count + 1));
        
        if (NULL == p) {
            perror("malloc");
            if (prev)
                free(prev);
            return -1;
        }

        if (prev) {
            memcpy(p, prev, sizeof(int) * count);
            free(prev);
        }
        p[count] = new;
        count++;
    }

    for (i = 0; i < count; i++)
        printf("p[%d] = %d\n", i, p[i]);
    
    free(p);

    return 0;
}