c - 嵌套循环无法正常工作

Question

我正在尝试制作一个程序，询问您练习了多少天，然后每天询问您进行了多少次飞行，然后确定每天这些飞行的平均值，这是我现在的代码:

#include <stdio.h>

int main() {
    int days, flights, i;
    double length, total, average;

printf("How many days have you been practicing?\n");
scanf("%d", &days);

for(i=1; i<=days; i++) {
    printf("How many flights were completed in day #%d?\n", i);
    scanf("%d", &flights);
        for(i=1; i<=flights; i++){
            printf("How long was flight #%d?\n", i++);
            scanf("%lf", &length);
            length += total;
            average = total / flights;
            printf("Day #%d: The average distance is %.3lf\n", i, average);
            }
    }
    return 0;
}

现在示例输出如下所示:

How many days have you been practicing?

2

How many flights were completed in day #1?

2

How long was flight #1?

5.00

Day #3: The average distance is 0.000.

How many flights were completed in day #2?

3

How long was flight #1?

7.50

How long was flight #3?

13.00

Day #5: The average distance is 0.000.

如您所见，目前的输出存在多个问题，未计算平均距离，我无法为每个航类输入数字，并且航类号和日期号不正确。任何帮助将不胜感激，因为我是新手!例如，最终输出应如下所示:

How many days have you been practicing?

2

How many flights were completed in day #1?

2

How long was flight #1?

5.00

How long was flight #2?

10.00

Day #1: The average distance is 7.500.

How many flights were completed in day #2?

3

How long was flight #1?

7.50

How long was flight #2?

13.00

How long was flight #3?

15.75

Day #2: The average distance is 12.083.

Answer 1

有几个问题，我对我所做的每个修复都留下了评论。如果您有任何问题，请告诉我

#include <stdio.h>

int main() {
    int days, flights, i, j;
    double length, total, average;

    printf("How many days have you been practicing?\n");
    scanf("%d", &days);

    for (i = 1; i <= days; i++) {
        printf("How many flights were completed in day #%d?\n", i);
        scanf("%d", &flights);

        // Reset total
        total = 0.0;

        // Use a different index variable than i, I used j
        for (j = 1; j <= flights; j++) {
            // Do not increment i here (I removed i++)
            printf("How long was flight #%d?\n", j);
            scanf("%lf", &length);

            // This was probably backwards, you never assigned total
            //length += total;
            total += length;
        }

        // Compute the average per day outside the flights loop
        average = total / flights;
        printf("Day #%d: The average distance is %.3lf\n", i, average);
    }

    return 0;
}