#include <stdio.h> 
 
int main(void)
{
    double num,sum,tot;
    sum = 0;
    tot = 0;
    printf("データ: ");
    scanf("%lf", &num);
 
    while(num != 0)
    {
        sum+=num;
        tot++;
        printf("次のデータ: ");
        scanf("%lf", &num);
    }
    if(tot > 0)
    {
        double average = sum/tot;
        printf("\n件数:%d\n", (int)tot);  
        printf("合計:%.6f\n", sum); 
        printf("平均:%.6f\n", average);
    }
    else
    {
        printf("データがありません。\n");
    } 
 
    return 0;
}

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