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class Arith
{
    private:
        int x,y;
    public:
        int add();
        int sub();
        int mul();
        int div();
};
int Arith::add()
{
    cout<<"Enter the x value"<<endl;
    cin>>x;
    cout<<"Enter the y value"<<endl;
    cin>>y;
    return(x+y);
}
int Arith::sub()
{
    cout<<"Enter the x value"<<endl;
    cin>>x;
    cout<<"Enter the y value"<<endl;
    cin>>y;
    return(x-y);
}
int Arith::mul()
{
    cout<<"Enter the x value"<<endl;
    cin>>x;
    cout<<"Enter the y value"<<endl;
    cin>>y;
    return(x*y);
}
int Arith::div()
{
    cout<<"Enter the x value"<<endl;
    cin>>x;
    cout<<"Enter the y value"<<endl;
    cin>>y;
    return(x/y);
}
main()
{
    Arith obj;
    char ch;
    clrscr();
    while(1)
    {
    cout<<"a:Addition"<<endl;
    cout<<"s:Subtraction"<<endl;
    cout<<"m:Multiply"<<endl;
    cout<<"d:Division"<<endl;
    cout<<"e:exit"<<endl;
    cout<<"Enter your Choice"<<endl;
    cin>>ch;
    switch(ch)
    {
        case 'a':
                int a=obj.add();
                cout<<"Addtion Result="<<a<<endl;
                break;
        case 's':
                int s=obj.sub();
                cout<<"Subtract Result="<<s<<endl;
                break;
        case 'm':
                int m=obj.mul();
                cout<<"Multiply Result="<<m<<endl;
                break;
        case 'd':
                int d=obj.div();
                cout<<"Division Result="<<d<<endl;
                break;
        case 'e':
                exit(0);
    }
    }
    getch();
} 

prog.cpp: In member function ‘int Arith::add()’:
prog.cpp:14:5: error: ‘cout’ was not declared in this scope
     cout<<"Enter the x value"<<endl;
     ^~~~
prog.cpp:14:32: error: ‘endl’ was not declared in this scope
     cout<<"Enter the x value"<<endl;
                                ^~~~
prog.cpp:15:5: error: ‘cin’ was not declared in this scope
     cin>>x;
     ^~~
prog.cpp: In member function ‘int Arith::sub()’:
prog.cpp:22:5: error: ‘cout’ was not declared in this scope
     cout<<"Enter the x value"<<endl;
     ^~~~
prog.cpp:22:32: error: ‘endl’ was not declared in this scope
     cout<<"Enter the x value"<<endl;
                                ^~~~
prog.cpp:23:5: error: ‘cin’ was not declared in this scope
     cin>>x;
     ^~~
prog.cpp: In member function ‘int Arith::mul()’:
prog.cpp:30:5: error: ‘cout’ was not declared in this scope
     cout<<"Enter the x value"<<endl;
     ^~~~
prog.cpp:30:32: error: ‘endl’ was not declared in this scope
     cout<<"Enter the x value"<<endl;
                                ^~~~
prog.cpp:31:5: error: ‘cin’ was not declared in this scope
     cin>>x;
     ^~~
prog.cpp: In member function ‘int Arith::div()’:
prog.cpp:38:5: error: ‘cout’ was not declared in this scope
     cout<<"Enter the x value"<<endl;
     ^~~~
prog.cpp:38:32: error: ‘endl’ was not declared in this scope
     cout<<"Enter the x value"<<endl;
                                ^~~~
prog.cpp:39:5: error: ‘cin’ was not declared in this scope
     cin>>x;
     ^~~
prog.cpp: In function ‘int main()’:
prog.cpp:48:12: error: ‘clrscr’ was not declared in this scope
     clrscr();
            ^
prog.cpp:51:5: error: ‘cout’ was not declared in this scope
     cout<<"a:Addition"<<endl;
     ^~~~
prog.cpp:51:25: error: ‘endl’ was not declared in this scope
     cout<<"a:Addition"<<endl;
                         ^~~~
prog.cpp:57:5: error: ‘cin’ was not declared in this scope
     cin>>ch;
     ^~~
prog.cpp:64:14: error: jump to case label [-fpermissive]
         case 's':
              ^~~
prog.cpp:61:21: note:   crosses initialization of ‘int a’
                 int a=obj.add();
                     ^
prog.cpp:68:14: error: jump to case label [-fpermissive]
         case 'm':
              ^~~
prog.cpp:65:21: note:   crosses initialization of ‘int s’
                 int s=obj.sub();
                     ^
prog.cpp:61:21: note:   crosses initialization of ‘int a’
                 int a=obj.add();
                     ^
prog.cpp:72:14: error: jump to case label [-fpermissive]
         case 'd':
              ^~~
prog.cpp:69:21: note:   crosses initialization of ‘int m’
                 int m=obj.mul();
                     ^
prog.cpp:65:21: note:   crosses initialization of ‘int s’
                 int s=obj.sub();
                     ^
prog.cpp:61:21: note:   crosses initialization of ‘int a’
                 int a=obj.add();
                     ^
prog.cpp:76:14: error: jump to case label [-fpermissive]
         case 'e':
              ^~~
prog.cpp:73:21: note:   crosses initialization of ‘int d’
                 int d=obj.div();
                     ^
prog.cpp:69:21: note:   crosses initialization of ‘int m’
                 int m=obj.mul();
                     ^
prog.cpp:65:21: note:   crosses initialization of ‘int s’
                 int s=obj.sub();
                     ^
prog.cpp:61:21: note:   crosses initialization of ‘int a’
                 int a=obj.add();
                     ^
prog.cpp:77:23: error: ‘exit’ was not declared in this scope
                 exit(0);
                       ^
prog.cpp:80:11: error: ‘getch’ was not declared in this scope
     getch();
           ^

Standard output is empty