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program to find factorial of a number

program to find factorial of a number

Write a C program to input a number and calculate its factorial using for loop. How to find factorial of a number in C program using loop.

What is factorial?

Factorial of a number n is product of all positive integers less than or equal to n. It is denoted as n!.

For example factorial of 5 = 1 * 2 * 3 * 4 * 5 = 120
Logic to find factorial of a number

    Input a number from user. Store it in some variable say j.
    Initialize another variable that will store factorial say fact = 1.

    Why initialize fact with 1 not with 0? This is because you need to perform multiplication operation not summation. Multiplying 1 by any number results same, same as summation of 0 and any other number results same.
    Run a loop from 1 to j, increment 1 in each iteration. The loop structure should look like for(x=1; x<=j; x++).
    Multiply the current loop counter value i.e. x with fact. Which is fact = fact * x.

#include <stdio.h>

int main()
{
    int x, j;
    unsigned long long fact=1LL;

    /* Input number from user */
    printf("Enter any number to calculate factorial: ");
    scanf("%d", &j);

    /* Run loop from 1 to j */
    for(x=1; x<=j; x++)
    {
        fact = fact * x;
    }

    printf("Factorial of %d = %llu", j, fact);

    return 0;
}

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