Question

有谁知道这段代码有什么问题？即使在输入＆gt; 1行之后，程序也会在代码结束时提前结束，而不允许嵌套while重复。谢谢。

#include <stdio.h>
int main() {
        int line;
        unsigned int sum = 0;
        int input;
        float average;
        printf("Enter number of input lines:");
        scanf("%d", & line);
        while (line > 0) {

            while (input != -1) {
                printf("Enter input line:");
                scanf("%d", & input);
                sum += input;
                printf("sum is %d", sum);
                printf("Line is %d", line);
            }
            line--;
            printf("Line is %d", line);
        }
        return 0;
    }

Answer 1

在你的程序中，内循环条件基于变量input。但是在退出内循环之前，它的值在内循环内设置为-1。但变量input的值一旦变为-1就不会改变。

修改如下以在外循环的每次迭代中输入内循环

printf("Enter number of input lines:");
scanf("%d",&line);
while (line>0) {
input = 0;    /* This line is additional */
while (input != -1) {
    printf("Enter input line:");
    scanf("%d",&input);
    sum += input;
    printf("sum is %d",sum);
    printf("Line is %d",line);
    }
    line--;
    printf("Line is %d",line);
}

循环使用while

1 个答案: