警告 C4715:并非所有控制路径都返回值 c++ - 无法通过测试 [英] warning C4715: not all control paths return a value c++ - cant pass a test

问题描述

我遇到此代码的问题:

问题是我不断收到警告 C4715，尽管 .exe 运行正常，并且它为我正在尝试解决的问题提供了正确答案.警告使得无法在应用程序内传递任务.请告诉我为什么我在 if 语句中使用的return"不起作用.

The problem is I'm constantly getting warning C4715 despite the fact .exe is running correctly and it gives correct answer to a problem I'm trying to resolve. The warning makes it impossible to pass the task inside the app. Please give me a clue why 'return' used by me in the if sentences doesn't work.

#include <utility>
#include <iostream>


    std::pair<int, int> solve(int a, int b) {
    
        if (a == 0 || b == 0) {
            std::pair <int, int> kek(a, b);
            return kek;
    
        }
        else if (a >= 2 * b) {
            a = (a - (2 * b));
            solve(a, b);
        }
        else if (b >= 2 * a) {
            b = (b - (2 * a));
            solve(a, b);
        }
        else {
            std::pair <int, int> kek(a, b);
            return kek;
        }
        
    }
    
    int main() {
        bool result{ solve(22, 5) == std::make_pair(0,1) };
        std::cout << result;
        return 0;
    }

推荐答案

如果 a == 0 || 你的 solve 函数不会执行 return 语句b == 0 不为真，a >= 2 * b 或 b >= 2 * a 之一为真.

Your solve function won't execute return statement if a == 0 || b == 0 is not true and either one of a >= 2 * b or b >= 2 * a is true.

看起来solve函数中的两个solve(a, b);应该是return solve(a, b);.

It seems that the two solve(a, b); in the solve function should be return solve(a, b);.

这篇关于警告 C4715:并非所有控制路径都返回值 c++ - 无法通过测试的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！