没有调用 C++ 函数

Question

这个问题在这里已经有了答案:





Calling a function in main

(4 个回答)


3年前关闭。




我是一个新的相对较新的程序员，我决定用 C++ 编写代码。目前，我正在开发一个转换器应用程序项目。我想从金钱转换为体重，再转换为温度，如果可能的话，甚至更多。我写了一个很好的代码块，我想检查它是否有效。出于某种原因，代码确实编译了，但所有应用程序确实给了我一个空白屏幕，没有区域可以输入值或任何东西。它没有显示我写的说明或任何东西。

这是代码:

#include "std_lib_facilities.h"

int a = 0;
int b = 0;
int c = 0;

int money()
{
    cout << "This will convert CAD to either USD or EUR\n";
    cout << "Please input USD or EUR followed by an enter keystroke for conversion\n";
    string a;
    while(cin >> a){
        if( a == "USD"){
            cout << "If you would like to convert USD into CAD, enter 1.\n";
            cout << "If you would like to convert CAD into USD, enter 2.\n";
            int x;
            cin >> x;
            if( x == 1){
                cout << "Please enter the amount you wish to convert.\n";
                double j;
                cin >> j;
                double k = j*1.29;
                cout << j << "USD is " << k << "CAD.\n";

            }
            if ( x == 2){
                cout << "Please enter the amount you wish to convert.\n";
                double o;
                cin >> o;
                double p = o*0.77;
                cout << o << "CAD is " << p << "USD.\n";
            }
        }
        if( a == "EUR"){
            cout << "If you would like to convert EUR into CAD, enter 1.\n";
            cout << "If you would like to convert CAD into EUR, enter 2.\n";
            int y;
            cin >> y;
            if(y == 1){
                cout << "Please enter the amount you wish to convert.\n";
                double g;
                cin >> g;
                double h = g*1.46;
                cout << g << "EUR is " << h << "CAD.\n";

            }
            if(y == 2){
                cout << "Please enter the amount you wish to convert.\n";
                double z;
                cin >> z;
                double x = z*0.69;
                cout << z << "CAD is " << x << "EUR.\n";
            }

        }
    }

}

int weight()
{
    cout << "This will convert pounds to kilograms.\n";
    cout << "Please input the amount you wish to convert.\n";
}

int temperature()
{

}

int setup()
{
    cout << "Please enter either a,b or c for the corresponding conversions.\n";
    cout << "(Where a is for currency, b is for weight, and c is for temperature.\n";
    string a;
    while ( cin >> a){
        if( a == "a"){
            int money();
            }
        if( a == "b"){
            int weight();
        }
        if( a == "c"){
            int temperature();
        }
    }
}

int main()
{
    cout << "Welcome to the ultimate converter app.\n";
    int setup();
    return 0;
}

任何帮助，将不胜感激。

编辑:抱歉给大家带来了麻烦。感谢所有回答的人，我刚刚意识到我声明了一个函数而不是调用它。

Answer 1

替换 int setup();至setup();在 main() .
int setup();只是声明函数，但不要调用它。

您还必须更正setup() :

void setup()
{
    cout << "Please enter either a, b or c for the corresponding conversions." << endl;
    cout << "Where a is for currency, b is for weight, and c is for temperature." << endl;

    string str;
    while (cin >> str) {
        if (str == "a") {
            money();
        }
        else if (str == "b") {
            weight();
        }
        else if (str == "c") {
            temperature();
        }
        else {
            cout << "Invalid input." << endl; 
        }
    }
}

money() , weight()和 temperature()必须返回 void也输入。