Macro with Arguments

    #include <iostream.h>
    #include <conio.h>
    /* macro definition */
    #define xyz(a)        b = a * 2 ;
    void main()
    {
        int x = 3, b ;
        clrscr () ;
        xyz ( x ) ;                 /* call to macro 'xyz' */
        cout << "After first call to the macro 'xyz'...\n" ;
        cout << "b ="  << b ;
        xyz ( x + 5 ) ;          /* call to macro 'xyz' */
        cout <<"\n\nAfter second call to the macro 'xyz'...\n";
        cout << "b = " << b ;
        getch () ;
    }