#include <stdio.h>

void main() // 改成 int main ()

{

int score, max, min, average, sum, i = 1;

scanf("%d\n", &score); // 如果這時候輸入是 -1 呢

sum = max = min = score;

while (score != -1) { // 這種應該用 do while

scanf("%d", &score);

i++;

if (score > max)

max = score;

if (score < min)

min = score;

sum += score;

}

average = sum / i; // 平均分最好不要用 int

printf("%d%d%d%d", max, min, average, sum);

}

我修改了一下

#include <stdio.h>

int main()

{

int score, max, min, sum, i;

double average;

printf("請輸入分數\n");

scanf("%d", &score);

if (score == -1) return 0;

i = 0;

sum = 0;

max = min = score;

do {

i++;

if (score > max)

max = score;

if (score < min)

min = score;

sum += score;

scanf("%d", &score);

} while(score != -1);

average = (double)sum / (double)i;

printf("%d, %d, %f, %d\n", max, min, average, sum);

}