Question

我正在尝试制作一个程序，询问您练习了多少天，然后每天询问您制作了多少航班，然后确定每天的航班平均值，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：

你练了几天？

2

第1天完成了多少次航班？

2

1号航班有多长时间？

5.00

第3天：平均距离为0.000。

第2天完成了多少次航班？

3

1号航班有多长时间？

7.50

3号航班有多长时间？

13.00

第5天：平均距离为0.000。

正如您所看到的，现在输出存在多个问题，平均距离没有计算，我无法为每个航班输入数字，而且航班和日期＃是不正确的。任何帮助将不胜感激，因为我是新手！举个例子，最终输出应该是这样的：

你练了几天？

2

第1天完成了多少次航班？

2

1号航班有多长时间？

5.00

2号航班有多长时间？

10.00

第1天：平均距离是7.500。

第2天完成了多少次航班？

3

1号航班有多长时间？

7.50

2号航班有多长时间？

13.00

3号航班有多长时间？

15.75

第2天：平均距离为12.083。

Answer 1

有几个问题，我为每个修复程序留下了评论。如果您有疑问，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;
}

Answer 2

为内部for循环使用不同的循环计数器。例如。使用j代替i。

for(int j=1; j<=flights; j++){

您还需要从内循环移动以下行。

average = total / flights;
printf("Day #%d: The average distance is %.3lf\n", i, average);

它们应该在内循环之后。

Answer 3

请注意，您已为两个循环使用了相同的迭代变量：

 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++){
        ...

使用另一个变量j：

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

此外，您需要按如下方式更正业务逻辑：

for(i=1; i<=days; i++) {
    total = 0.0;
    printf("How many flights were completed in day #%d?\n", i);
    scanf("%d", &flights);
    for(j=1; j<=flights; j++){
        printf("How long was flight #%d?\n", j);
        scanf("%lf", &length);
        total += length;
}
average = total / flights;
printf("Day #%d: The average distance is %.3lf\n", i, average);

}

Answer 4

我修复了你的代码。你不能在嵌套的＃34;中使用相同的变量来实现＆＃34;循环，因为第二次使用变量会混淆第一次使用同一个变量。出于这个原因，我添加了一个名为J的计数器变量。

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

嵌套循环无法正常工作

4 个答案: