C Program to find the factorial of a given number

C Program to find the factorial of a given number

Problem:

Write a C program that will get the factorial of the given number.

Solution:

Logic to make a factorial number:

That means, take a number and multiply every number upto one.
In programming, take a simple for loop or while loop. Multiply and add the number from one to that number.

C Code for factorial number:

#include <stdio.h>
 
int main()
{
  int i, n, fact = 1;
 
  printf("Enter a number to find it's factorial = \n");
  scanf("%d", &n);
 
  for (i = 1; i <= n; i++)
    fact = fact * i;
 
  printf("Factorial of %d = %d\n", n, fact);
 
  return 0;
}

Run Code: [Give input as your wish like 5... output will be 120]

Now Get more perfect code for long number factorials

C Code for factorial number:

Problem of previous code was it can't return a large  numbers factorial. That return a furbage value. So, to get a better result just use this code to find factorial in c.

#include <stdio.h>
int main()
{
    int n, i;
    unsigned long long factorial = 1; //take long integer to get a big factorial

    printf("Enter an integer: ");
    scanf("%d",&n);

    // show error if the user enters a negative integer
    if (n < 0)
        printf("Error! Factorial of a negative number doesn't exist.");

    else
    {
        for(i=1; i<=n; ++i)
        {
            factorial *= i;              // factorial = factorial*i;
        }
        printf("Factorial of %d = %llu", n, factorial);
    }

    return 0;
}

Tags:
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