c语言5-7

1、

#include <stdio.h>

#define NUMBER 4

int main(void)
{
    int i, a[NUMBER];
    
    printf("the number of elements: %d\n", NUMBER);
    for(i = 0; i < NUMBER; i++)
    {
        printf("NO.%d: ", i + 1); scanf("%d", &a[i]);
    }
    
    printf("{");
    for(i = 0; i < NUMBER; i++)
    {
        if(i == NUMBER - 1)
        {
            printf("%d", a[i]);
        }
        else
        {
            printf("%d,",a[i]);
        }
    }
    printf("}");
    return 0;
}