Program: Permutation and Combination

    #include <iostream.h>
    void main()
    {
        int i , n , r , P , C ;
        int factorial , temp , result ;
        cout<<"Enter a number,n and r :\n";
        cin>>n>>r;
             for (i=1,factorial=1 ; i<=n ; i++)    /* Calculate n! */
            factorial = factorial * i ;

             for (i=1,temp=1 ; i<=r ; i++)         /* Calculate r! */
            temp = temp * i ;
    for (i=1,result=1 ; i<=(n-r) ; i++)    /* Calculate (n-r)!*/
            result = result * i ;
    P = factorial / temp ;
    C = P / result ;

    cout<<"Permutation  : "<<P;
    cout<<"Combination  :  "<<C;
    }