Programe read +ve number integer and prints its factorial

#include<conio.h>

#include<iostream.h>

void main()

{

clrscr();

int n, i;

unsigned long  f=1;

cout<<"Emter the Number: ";

cin>>n;

if(n<=0)

cout<<"Please Enter valid number";

else

{

for (i=n; i>=1; i--)

{

f=f*i;

}

cout<<"Factorial of "<<n<<" = "<<f;

}

getch();

}

Output

Enter the Number: 5

Factorial of 5 = 120