Program For Factorial in C (With Easy Explanation Example)

In this article, we will know how to find the factorial of any number in the C language.

In the programming language, we should make this program normally.

So first of all, know what is hot factorial and how to perform it through a program in C language.

What is Factorial Number

From a program point of view, a program in which a number is inputted and all the digits up to that number are multiply shown as output is called a factorial number.

Suppose the input number is 6 then the factorial number of 6 will be 750.

By this, we can easily calculate and multiply all the digits up to 

6! = 6 * 5 * 4 * 3 * 2 * 1 = 120

In Mathematical Forum, the factorial of any number is denoted by n! 

6! = 6 * 5 * 4 * 3 * 2 * 1 = 120

8! = 8 * 7 * 6 * 5 * 3 * 2 * 1 = 6

We will do this through  of programs, in C programming 

• Use Loop for Find factorial (Increment)
• Use Loop for Find factorial (Decrement)
• Use recursion to find factorial

1.Program for Factorial In C

#include <stdio.h>

#include <conio.h>

    void main ()

    {

int a, b, factorial = 1;

printf ("Enter the number \ n");//Find Factorial

scanf ("% d", & b);

for (a = b; a> 0; a--)

{

factorial = factorial * a;

}

printf ("Factorialorial : % d", factorial);

getch ();

}

Input

Enter the number for Factorial 6

Output

Factorial of En Number = 720

Explanation

In this program, we have taken three integer variables a, b and factorial.

In which the value of factorial is 1.

Then the value is entered which values to find factorial.

Now for loop (a = b; a> 0; a--) loop is run  in which

The condition is that the value of b will be assigned to a.

Then a decrement of a will occur in the loop as long as a> 0.

As long as the loop runs

Factorial = factorial * a;

Then the value of the factorial is printed.

2.Program for Factorial In C

#include <stdio.h>

int main ()

{

        int a, b, factorial = 1;

         printf ("Enter the number \ n");   //Find Factorial

scanf ("% d", & b);

for (a = 1; a <= b; a ++)

{

factorial = factorial * a;

}

printf ("Factorialorial of Enter Number =% d", factorial);

getch ();

}

Input

Enter the number 5

Output

Factorialorial of Enter Number = 120

Explanation

In this program we have taken three integer variables a, b and factorial.

In which the value of factorial is 1.

Then the value is entered, the value of which is to be factorial found.

Now for loop (a = 1; a <= b; a ++)  in which

The condition is that in which a = 1.

Then there will be an increment of an in the loop until a <= b.

As long as the loop runs

Factorial = factorial * a;

Then the value of the factorial is printed.

3.Program For Find Factorial In C

#include <stdio.h>

long fact (int);

int main ()

{

  int x;

  printf ("Enter the number for Factorial \ n");

  scanf ("% d", & x);

  printf ("% d! =% ld \ n", x, fact (x));

  return 0;

}

long fact (int x)

{

  int y;

  long z = 1;

  for (y = 1; y <= x; y ++)

    z = z * y;

  return z;

}

4.Program for Factorial In C Using Recursion 

#include <stdio.h>

      

    long fact (int a)

    {

      if (a == 0)

        return 1;

      else

        return (a * fact (a-1));

    }

       

    void main ()

    {

      int n;

      long factorial;

      printf ("Enter the number for Factorial:");

      scanf ("% d", & n);

       

      factorial = fact (n);

      printf ("Factorialorial of Enter Number% d Is% ld \ n", n, factorial);

      return 0;

    }

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