Questions about this program in c++

Originally Posted by man silence

Done that gave me 12 error
I will try later
Thank you
good night
D:\c++\rrrrrrrrrrr.cpp(88) : error C2360: initialization of 'y' is skipped by 'case' label
D:\c++\rrrrrrrrrrr.cpp(81) : see declaration of 'y'
D:\c++\rrrrrrrrrrr.cpp(88) : error C2360: initialization of 'i' is skipped by 'case' label
D:\c++\rrrrrrrrrrr.cpp(71) : see declaration of 'i'
D:\c++\rrrrrrrrrrr.cpp(88) : error C2360: initialization of 'z' is skipped by 'case' label
D:\c++\rrrrrrrrrrr.cpp(65) : see declaration of 'z'
D:\c++\rrrrrrrrrrr.cpp(99) : error C2360: initialization of 'a' is skipped by 'case' label
D:\c++\rrrrrrrrrrr.cpp(90) : see declaration of 'a'
D:\c++\rrrrrrrrrrr.cpp(99) : error C2360: initialization of 'y' is skipped by 'case' label
D:\c++\rrrrrrrrrrr.cpp(81) : see declaration of 'y'
D:\c++\rrrrrrrrrrr.cpp(99) : error C2360: initialization of 'i' is skipped by 'case' label
D:\c++\rrrrrrrrrrr.cpp(71) : see declaration of 'i'
D:\c++\rrrrrrrrrrr.cpp(99) : error C2360: initialization of 'z' is skipped by 'case' label
D:\c++\rrrrrrrrrrr.cpp(65) : see declaration of 'z'
D:\c++\rrrrrrrrrrr.cpp(102) : error C2361: initialization of 'a' is skipped by 'default' label
D:\c++\rrrrrrrrrrr.cpp(90) : see declaration of 'a'
D:\c++\rrrrrrrrrrr.cpp(102) : error C2361: initialization of 'y' is skipped by 'default' label
D:\c++\rrrrrrrrrrr.cpp(81) : see declaration of 'y'
D:\c++\rrrrrrrrrrr.cpp(102) : error C2361: initialization of 'i' is skipped by 'default' label
D:\c++\rrrrrrrrrrr.cpp(71) : see declaration of 'i'
D:\c++\rrrrrrrrrrr.cpp(102) : error C2361: initialization of 'z' is skipped by 'default' label
D:\c++\rrrrrrrrrrr.cpp(65) : see declaration of 'z'
D:\c++\rrrrrrrrrrr.cpp(109) : fatal error C1004: unexpected end of file found
Error executing cl.exe.

rrrrrrrrrrr.exe - 12 error(s), 0 warning(s)

These errors would not be here if you listened to what Salem said in post 3. You are being asked to make a program that is hard enough, that you need to use functions to do it. Before you say you don't know what functions are, they are easy to learn: Functions in C and C++ - Cprogramming.com

Functions are useful because they break your program up into sections you can call whenever you want. Then read Salem's reply again. Suddenly everything makes sense.

I really do hope you try. So far you have shown a fantastic lack of effort.

If you had followed the previous advises you'd have reached the solution a long time ago.
You have missed only one closing bracket, ignoring other bad practices. You need to close the switch block before ending the loop.
Try compiling this program...

Code:

#include<iostream>
 using namespace std;
int main()
{
    float x,y,r;
    const double p=3.14;
    double area;              
    float a,b;
    float d;
    int choes ;
    
    do {
        cout<<"[simple porogram]"<<endl;
        cout<<" ==============="<<endl;
        cout<<"main menu"<<endl;
        cout<<"========="<<endl;
        cout<<" Enter the number (1) to calculate area and vicinity of rectangle . "<<endl;
        cout<<" Enter the number (2) to calculate area and vicinity of circle . "<<endl;
        cout<<" Enter the number (3) to calculate area of triangle . "<<endl;
        cout<<" Enter the number (4) to calculate  vicinity of triangle . "<<endl;
        cout<<" Enter the number (5) to calculate area and vicinity of square . "<<endl;
        cout<<" Enter the number (6) to drow a rectangle ."<<endl;
        cout<<" Enter the number (7) to drow a triangle ."<<endl;
        cout<<" Enter the number (8) to drow diamond."<<endl;
        cout<<" Enter the number (0) to end program."<<endl;//another suggestion to improe the menu.
        cout<<" ===================================="<<endl;
        cout<<" Enter the number :"<<endl;
    
        cin>>choes;
    
        switch (choes)
        {
            case 1:
                cout<<"enter the length  : ";
                cin>>x;
                cout<<"enter the width :";
                cin>>y;
                cout<<"the area of rectangle is :"<<x*y<<endl;
                cout<<"the vicinity of rectangle is :"<<(x+y)*2<<endl;
                break ;
            case 2:
                cout<<"enter the radius :"<<endl;
                cin>>r;
                area=(r*r)*p;
                cout<<"the area of circle is :"<<area<<endl;
                cout<<"the vicinity of circle is :"<<(r*p)*2<<endl;
                break;
            case 3:
                cout<<"Enter the hight and base :"<<endl;
                cin>>a>>b;
                cout<<"the area of triangle is :"<<0.5*a*b<<endl;
                break;
            case 4:
                cout<< "Enter lengths ribs :"<<endl;
                cin>>a>>b>>d;
                cout<< "the vicinity of triangle is :"<<a+b+d<<endl;
                break;
            case 5:
                cout<<"Enter the length of the rib :   "<<endl;
                cin>>d,
                cout<<"the area of square is :"<<d*d<<endl;
                cout<<"the vicinity of square is :"<<d*4<<endl;
                break;
            case 6:
                
                    for(int z=1; z<=79; z++)
                    {
                        cout << "*";
                    }
                    cout << endl;
    
                    for(int i=1; i<=10; i++)
                    {
                        cout << "*";
                        for(int j=1; j<=77; j++)
                        {
                            cout << " ";
                        }
                        cout << "*" << endl;
                    }
    
                    for(int y=1; y<=79; y++)
                    {
                        cout << "*";
                    }
                    cout << endl;
                
                break;
            case 7:
                
                    for (int a = 1; a <= 20; a++)
                    {
                        for (int i = 1; i <= a; i++)
                            cout << "*";
                        cout << endl;  
                    }
                cout << endl;
                
                break ;
            case 8:
                cout << "      * \n    * * *\n   * * * *\n  * * * * *\n * * * * * *\n* * * * * * *\n * * * * * *\n  * * * * *\n   * * * *\n    * * *\n      * \n";
                break;
            default :
                cout<<" error "<<endl;
                cout<<" (wrong  choice) "<<endl;
           }//this is the closing bracket you were missing!
    
        } while ( choes != 0 );
      return 0;//you missed this also.    
    }