#include <stdio.h>
 
double avgup(int n, int total, int count) {
    total += n;
    count++;
    return (double)total / count;
}
 
int main(void) {
    int num;
    int total = 0;
    int count = 0;
    double avg;
 
    while (1) {
        printf("非負の整数を入力してください（負の数で終了）：");
        scanf("%d", &num);
 
        if (num < 0) break;
 
        avg = avgup(num, total, count);
        total += num;
        count++;
 
        printf("現在の平均値：%.2f\n", avg);
    }
 
    printf("終了します。\n");
    return 0;
}

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