malloc

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 
 4 int main(void)
 5 {
 6     int number;
 7     int *a;
 8     int i;
 9     printf("请输入数量：");
10     scanf("%d", &number);
11     //int a[number];
12 
13     a = (int *)malloc(number * sizeof(int));
14     for (i = 0; i < number; i++)
15     {
16         scanf("%d", &a[i]);
17     }
18 
19     for (i = number - 1; i >= 0; i--)
20     {
21         printf("%d\n", a[i]);
22     }
23 
24     free(a);
25     return 0;
26 }