C++ program to find factorial of a number by using friend function

Program

#include<iostream.h>

#include<conio.h>

//void fact(b);

class b

{

int n;

friend void fact(b);

void print();

public:

b(int p)

{

n=p;

}

};

void b::print()

{

long f=1;

for(int i=1;i<=n;i++)

f*=i;

cout<<"factorial is==>"<<f;

}

void fact(b a)

{

a.print();

}

void main()

{

int n;

clrscr();

cout<<"enter the number==>";

cin>>n;

b a(n);

fact(a);

getch();

}

Output:

enter the number==>5

factorial is==>120