Program:

    #include<iostream.h>
    #include<conio.h> 

    class inches 
    {
    private: 
    float in,tot; 
    public:
    void getinch(void); 
    void showinch(void);
    };
    class feet 
    {
    private: 
    float ft,tot; 
    public:
    void getfeet(void); 
    void showfeet(void);
    };
    void inches::getinch(void) 
    {
    cout<<"\n\nEnter inches : ";
    cin>>in;
    }
    void inches::showinch(void) 
    {
    float inch=1;
    float feet=0.083333333;
    if(inch<=in)
    {
    tot=in*feet;
    cout<<"\n\nThe Entering Inches is converted into the Feet : "<<tot<<endl;
    }
    else 
    {
    cout<<"0"; 
    }
    }
    void feet::getfeet(void) 
    {
    cout<<"\n\nEnter feet : ";
    cin>>ft;
    }
    void feet::showfeet() 
    {
    float feet=1; 
    float inch=12; 
    if(feet<=ft) 
    {
    tot=ft*inch;
    cout<<"\n\nThe Entering Feet is converted into Inches : "<<tot<<endl;
    }
    else
    {
    cout<<"0";
    }
    }
    void main() 
    {
    char a,b,c; 
    l:
    clrscr(); 
    inches i; 
    feet f;
    cout<<"\n\nDo you want to convert Inches into Feet : "; 
    cin>>a;
    if(a=='y'||a=='Y')
    {
    i.getinch();
    i.showinch();
    }
    cout<<"\n\nDo you want to convert Feet into Inches : 
    cin>>b;
    if(b=='y'||b=='Y') 
    {
    f.getfeet();
    f.showfeet();
    }
    cout<<"\n\n\t\tConversion over"<<endl; 
    cout<<"\t\t********** ****"<<endl; 
    cout<<"\n\nDo u want to continue[y/n]  : ";
    cin>>c;
    if(c=='y'!!c=='Y')
    goto l;
    getch();
    }