c - 我的返回值有问题吗？

Question

我必须创建一个函数，打印出数组中某个索引(例如 0-11 或 2-6 等)内的所有数字(在“main”中提供)。然后该函数必须返回最后一个索引值的值。

例如，给定数组

{8, 3, 6, 7, 9, 5, 3, 8, 6, 7, 4, 5}

如果我输入数字2和7，那么它应该printf {6 7 9 5 3 8}，然后返回8。然而它一直返回6`。

int index(int data[], int low, int high)
{       
    while(low <= high) {
        printf("%d\n", data[low]);
        low++;
    }

    return data[low];     
}

/* I know I could just put return[high], but i though it  
   wouldn't matter since 'low' keeps incrementing until low == high */

int main()
{       
    int activities[12] = {8, 3, 6, 7, 9, 5, 3, 8, 6, 7, 4, 5}; 
    int low, high;
    int x;

    printf("What is the starting day?  ");
    scanf("%d", &low);
    printf("What is the ending day?  ");
    scanf("%d", &high);

    x = index(activities, low, high);
    printf("\n\nThe function returns this value: %d",x);

    return 0;
}

Answer 1

当您返回data[low]时，low已经增加了1。low的最后一个值将是high + 1。 while 条件将失败并退出循环。

所以，你的代码应该是:

return data[high];