Question

我正在制作我的第一个项目c ++。这是一个简单的温度转换器。

我用if语句做了一个测试部分[代码1]。 if语句将比较用户输入。例如，如果您使用键入c然后键入k（Celsius-Kelvin）。它应该运行函数[code 2] CtoK（）;但我不是它运行所有功能为什么会这样做？

它尝试使用return但我没有（它也没有出错，所以我保留了它）

如果你们看到其他人请说Code on pastebin

也认为要记住：刚刚学会了学习C ++ 不是母语，所以如果有拼写和语法错误，请说出来，以便我可以从中学习

[code 1]

void whatToWhat(char firstDegrees, char secondDegrees) {
    if (firstDegrees == 'C' || 'c') {// tests if the user want form c to f
        if (secondDegrees == 'F' || 'f') {
            CtoF();
        }
    }if (firstDegrees == 'C' || 'c') {// tests if the user want form c to k
        if (secondDegrees == 'K' || 'k') {
            CtoK();
        }
    }if (firstDegrees == 'F' || 'f') {// tests if the user want form f to c
        if (secondDegrees == 'C' || 'c') {
            FtoC();
        } 
    }if (firstDegrees == 'F' || 'f') {// tests if the user want form f to k
        if (secondDegrees == 'K' || 'k') {
            FtoK();
        }
    }if (firstDegrees == 'K' || 'k') {// tests if the user want form k to f
        if (secondDegrees == 'F' || 'f') {
            KtoF();
        }
    }if (firstDegrees == 'K' || 'k') {// tests if the user want form k to c
        if (secondDegrees == 'C' || 'c') {
            KtoC();
        }
    }
}

[code 2]

 void CtoF() {// c to f furmula
    double input;
    cout << "Enter a number[Celsius-Fahrenheit]" << endl;
    cin >> input;
    cout << "it's " << input * 1.8 + 32 << " Fahrenheit " << endl;
    return;
}
void CtoK() {// c to k  furmula
    double input;
    cout << "Enter a number[Celsius-Kelvin]" << endl;
    cin >> input;
    cout << "it's " << input + 273.15   << " Kelvin " << endl;
    return;
}
void FtoC() {//f to c furmula
    double input;
    cout << "Enter a number[Fahrenheit-Celsius]" << endl;
    cin >> input;
    cout << "it's " << input / 1.8 - 32 << " Celsius " << endl;

}
void FtoK() {//f to k furmula
    double input;
    cout << "Enter a number[Fahrenheit-Kelvin]" << endl;
    cin >> input;
    cout << "it's " << input / 1.8 - 32 + 273.15 << " Kelvin " << endl;
    return;
}
void KtoF() {// k to f furmula
    double input;
    cout << "Enter a number[Kelvin-Fahrenheit]" << endl;
    cin >> input;
    cout << "it's " << (input - 273.15) * 1.8 + 32 << " Fahrenheit " << endl;

}
void KtoC() {// k to c furmula
    double input;
    cout << "Enter a number[Kelvin-Celsius]" << endl;
    cin >> input;
    cout << "it's " <<273.15 - input << " Celsius " << endl;
    return;
}

Answer 1

if(firstDegrees == 'K' || 'k')将始终评估为 true ，因为k 因为是Not Null，意味着有效，表示 True 。

您需要以与此类似的方式编写所有表达式：(firstDegrees == 'K' || firstDegrees == 'k')

此外，您希望在每个else之后添加if s，以获得更好，更清晰的逻辑控制。

在我的程序中找不到bug / probleem

1 个答案: