611

#include <stdio.h>

#define NUMBER 7
int search(const int v[], int idx[], int key, int n)
{
    int i = 0, j = 0;
    while (i < n)
    {
        if (v[i] == key)
        {
            idx[j] = i;
            j++;
        }
        i++;
    }
    printf("{");
    for (i = 0; i < j; i++)
    {
        printf("%d ", idx[i]);
    }
    printf("}\n");
    printf("the number is %d\n", j);    
}

int main(void)
{
    int i, nu, a[NUMBER], b[NUMBER];
    puts("please input the elements.");
    for (i = 0; i < NUMBER; i++)
    {
        printf("a[%d] = ", i); scanf("%d", &a[i]);
    }
    printf("nu = "); scanf("%d", &nu);
    search(a, b, nu, NUMBER );
    return 0;
}