C Program To Find Factorial of a Number

In this article, we are going to write a c program to find factorial of a number.

We will make this program in the following way -:

1. C Program To Find Factorial of a Number Using For Loop
2. C Program To Find Factorial of a Number Using While Loop
3. C Program To Find Factorial of a Number Using Do While Loop

To make this program, we will use the following concept given below.

• What is Loop
• For Loop in C
• While Loop in C
• Do While Loop in C

If you do not know about these topics well, then you may not understand this program, so you should know about them in detail from the link given above.

Now without wasting time let’s start programming.

C Program To Find Factorial of a Number Using For Loop

Algorithm

• Program Start
• Declare Variables
• Input a number from the user
• Assign Value in the variable
• Loop start to find factorial
• Display factorial of a number
• Program End

Program

//C Program To Find Factorial of a Number Using For Loop

#include<stdio.h>
void main()
{
  int i,fact=1,n;

  printf("Enter a number: ");
  scanf("%d",&n);

  for(i=1;i<=n;i++)
      fact=fact*i;

  printf("Factorial of %d is: %d",n,fact);

}

Output

Enter a number: 3
Factorial of 3 is: 6

C Program To Find Factorial of a Number Using While Loop

Program

//C Program To Find Factorial of a Number Using While Loop

#include<stdio.h>
void main()
{
  int i=1 ,fact=1,n;

  printf("Enter a number: ");
  scanf("%d",&n);

  while(i<=n)
  {
      fact=fact*i;
      i++;
  }
  printf("Factorial of %d is: %d",n,fact);

}

Output

Enter a number: 5
Factorial of 5 is: 120

C Program To Find The Factorial of a Number Using Do While Loop

Program

//C Program To Find Factorial of a Number Using Do While Loop 

#include<stdio.h>
void main()
{
  int i=1 ,fact=1,n;

  printf("Enter a number: ");
  scanf("%d",&n);

  do
  {
      fact=fact*i;
      i++;
  } while(i<=n);
  printf("Factorial of %d is: %d",n,fact);

}

Output

Enter a number: 10
Factorial of 10 is: 3628800

Read More

• Download C Language Notes Pdf
• C Language Tutorial For Beginners
• C Programming Examples With Output
• 250+ C Programs for Practice PDF Free Download

Conclusion

So friends, in this article, we have written a c program to find factorial of a number in this ways -:

1. C Program To Find Factorial of a Number Using For Loop
2. C Program To Find Factorial of a Number Using While Loop
3. C Program To Find Factorial of a Number Using Do While Loop

If you have difficulty to understand any program or have any doubts or questions, then tell me in the comment below.