试图解决一个C ++示例并获得空输出

Question

我是C ++和编程的新手。我试着写这个程序

这是该程序的第一阶段，当我尝试运行它并把它立即转到其他它不读取如果

#include <iostream>
#include <string>
using namespace std;
void main()
{
    double x, y;
    double cost;
    char frt;
    char Frcr;
    char crow;
    char R , r, F , f ;
    int yes = 0, Yes = 0, No = 0, no = 0;
    cout << "Please Enter length and Width of the picture in Inches :\n";
    cin >> x >> y;
    cout << "Please Enter the Type of the Frame (R/F)(R Stands for Regular ,F Stands for Fancy) : \n";
    cin >> frt;


    if ('frt' == 'r' || 'frt' == 'R')
    {
        cost = (x + y)*0.15;
        cout << "Do you want to color the frame? (Yes/No) : \n";
        cin >> Frcr;

        if ('frcr' == yes || 'frcr' == Yes)
        {
            cost = (x + y)*0.15;
            cout << "The Cost is : " << (x + y)*0.15 + ((x + y)*0.10) << endl;
        }


        else if ('frcr' == no || 'frcr' == No)
        {
            cost = ((x + y)*0.15);
            cout << "The Cost Is : " << cost << endl;
        }



    }
    else
        cout << "There is an Error " << endl;
}

编辑：在工作人员的帮助下工作守则：）

#include <iostream>

using namespace std;
void main()
{
    double x, z;
    double cost;
    char frt;
    char Frcr;
    int Crow;
    int R, r, F, f;
    int y, Y, N, n;
    cout << "Please Enter The Width of the picture in Inches :";
    cin >> x;
    cout << "Please Enter The length of the picture in Inches :";

    cin >> z;
    cout << "Please Enter the Type of the Frame (R/F):" << endl;
    cout << "(R Stands for Regular ,F Stands for Fancy) \n";
    cin >> frt;



    if (frt == 'r' || frt == 'R')
    {
        cost = (x + z)*0.15;




        cout << "Do you want to color the frame? (Y/N) : \n";
        cin >> Frcr;
        if (Frcr == 'y' || Frcr == 'Y')
        {
            cout << "Type The Number Of The Crowns You Want ? :";
            cin >> Crow;
            cout << "The cost With Frame Coloring : " << ((x + z)*0.15) + ((x + z)*0.10) + (Crow*0.35) << endl;



        }
        else if (Frcr == 'N' || Frcr == 'n')
        {
            cout << "Type The Number Of The Crowns You Want ? :";
            cin >> Crow;
            cout << "The Cost is : " << ((x + z)*0.15) + (Crow*0.35) << endl;

        }
        else
            cout << "Invalid Input." << endl;


    }
    else if (frt == 'f' || frt == 'F')
    {

        cout << "Do you want to color the frame? (Y/N) : \n";
        cin >> Frcr;

        if (Frcr == 'y' || Frcr == 'Y')
        {
            cout << "Type The Number Of The Crowns You Want ? :";
            cin >> Crow;
            cout << "The cost With Frame Coloring : " << ((x + z)*0.25) + ((x + z)*0.10) + (Crow*0.35) << endl;



        }
        else if (Frcr == 'N' || Frcr == 'n')
        {

            cout << "Type The Number Of The Crowns You Want ? :";
            cin >> Crow;
            cout << "The Cost is : " << ((x + z)*0.25) + (Crow*0.35) << endl;

        }

        else
            cout << "Invalid Input." << endl;


    }


    else
        cout << "Invalid Input." << endl;



}

Answer 1

这'frt' == 'r'错了。 frt，fcrcr都是变量。删除＆＃39; ＆＃39 ;.它应该是：

frt == 'r'

由于许多原因，此'frcr' == yes也是错误的。 frcr也是一个变量，所以再次移除＆＃39; ＆＃39 ;.即使这样，你也不能frcr == "yes"而是：

1）将frcr更改为std::string或
2）保留char并将"yes"更改为'y'或'Y'。

编辑：你的代码在很多方面都是错误的。我建议你从基础开始。你需要学习。

Answer 2

最终工作代码。谢谢你们帮助它现在工作正常:) 如果与图片不同，请告诉我

#include <iostream>

using namespace std;
void main()
{
    double x, z;
    double cost;
    char frt;
    char Frcr;
    int Crow;
    int R , r, F , f ;
    int y , Y , N , n;
    cout << "Please Enter The Width of the picture in Inches :";
    cin >> x;
    cout << "Please Enter The length of the picture in Inches :";

    cin >> z;
    cout << "Please Enter the Type of the Frame (R/F)(R Stands for Regular ,F Stands for Fancy) : \n";
    cin >> frt;



    if (frt == 'r' || frt == 'R')
    {
        cost = (x + z)*0.15;




        cout << "Do you want to color the frame? (Y/N) : \n";
        cin >> Frcr;
        if (Frcr == 'y' || Frcr == 'Y')
        {
            cout << "Type The number of the crowns you want ? :";
            cin >> Crow;
            cout << "The cost With Frame Coloring : " << ((x + z)*0.15) + ((x + z)*0.10)+(Crow*0.35) << endl;



        }
        else if (Frcr == 'N' || Frcr == 'n')
        {
            cout << "Type The number of the crowns you want ? :";
            cin >> Crow;
            cout << "The Cost is : " << ((x + z)*0.15) + (Crow*0.35) << endl;

        }
        else
            cout << "Invalid Input." << endl;


    }
    else if (frt == 'f' || frt == 'F')
    {

        cout << "Do you want to color the frame? (Y/N) : \n";
        cin >> Frcr;

        if (Frcr == 'y' || Frcr == 'Y')
        {
            cout << "Type The number of the crowns you want ? :";
            cin >> Crow;
            cout << "The cost With Frame Coloring : " << ((x + z)*0.25) + ((x + z)*0.10)+(Crow*0.35) << endl;



        }
        else if (Frcr == 'N' || Frcr == 'n')
        {

            cout << "Type The number of the crowns you want ? :";
            cin >> Crow;
            cout << "The Cost is : " << ((x + z)*0.25) + (Crow*0.35) << endl;

        }

        else
            cout << "Invalid Input." << endl;


    }


    else
        cout << "Invalid Input." << endl;



    }