Find the Factorial of a Number: C++

Video tutorial to find the factorial of a number: if the user enters 3, then the factorial is 1 * 2 * 3 i.e., factorial = 6
This logic must be handled with a c++ program.

Full Source Code

#include<iostream .h>
#include<conio .h>
 
void main()
{
  int fact = 1, N;
  clrscr();
 
  cout< <endl<<"Enter a number\n";
  cin>>N;
 
  for( int i=1; i< =N; i++ )
   fact = fact * i;  // OR fact *= i;
 
  cout<<endl<<endl<<"Factorial of "<<N<<" is "<<fact;
 
  getch();
}

Here the for loop stars from 1 and not 0. As anything multiplied by 0 would also be zero.

fact *= i; is the compact representation of fact = fact * i;

Video Tutorial: Factorial in cpp

[youtube https://www.youtube.com/watch?v=ovrdIQZ6Hu8]

YouTube Link: https://www.youtube.com/watch?v=ovrdIQZ6Hu8 [Watch the Video In Full Screen.]

Output:
Enter a number
5
Factorial of 5 is 120

2 thoughts on “Find the Factorial of a Number: C++”

my program is just giving factorial for 1 and 2…..why it is giving wrong output for 3 and above numbers?…here is the code
#include
using namespace std;
int main()
{
int n,i,j;
int fact=1;
cin>>n;
for(i=1;i>i;
for(j=1;j<=i;j++)
{
fact=fact*j;
}
cout<<fact<<endl;
}
system ("pause");
return 0;
}

@domy, There’s no need of using two for loops.

Just follow the coding in our blog post / video and it must work properly.

2 thoughts on “Find the Factorial of a Number: C++”

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