Factorial Program in C++

#include<iostream.h>
#include<conio.h>
void main()
{
int i,fact=1,number;
clrscr();
cout<<"Enter the Number: "; cin>>number;
for(i=1;i<=number;i++)
{
fact=fact*i;
}
cout<<"Factorial of " <<number<<" is: "<<fact<<endl;
getch();
}

Output:

Factorial Program in C++ Using while Loop:

 

#include<iostream.h>
#include<conio.h>
void main()
{
int num, i, fact=1;
cout<<"Enter the Number: "; cin>>num;
i=num;
while(i>=1)
{
fact = fact*i;
i--;
}
cout<<"\nFactorial = "<<fact;
cout<<endl;
getch();
}

Output:

Factorial Program in C++ using Function:

 

#include<iostream.h>
#include<conio.h>
int Factorial(int);
void main()
{
int num, fact;
clrscr();
cout<<"Enter the Number: "; cin>>num;
fact = Factorial(num);
cout<<"\nFactorial = "<<fact;
cout<<endl; getch(); } int Factorial(int n) { int i, f=1; for(i=n; i>=1; i--)
f = f*i;
return f;
}

Output: