## Q. C Program to Find Factorial of a Given Number.

Here you will find an algorithm and program in C programming language to find factorial of a number. First let us understand what factorial means.

**Explanation : **The factorial of a number is the product of all the integers from 1 to that number.

**For Example : **
Factorial of 5 is 120 i.e. 5*4*3*2*1

## Algorithm to find factorial of a given number

START step 1 : Declare/Read the number n step 2 : [Initialize] i=1, fact=1 step 3 : Repeat step 4 and 5 until i=n step 4 : fact=fact*i step 5 : i=i+1 step 6 : Print fact STOP

# C Program to Find Factorial of a Number

#include <stdio.h> int main() { int num = 7, i; unsigned long long fact = 1; if (num < 0) printf("Error! Factorial of a negative number doesn't exist."); else { for (i = 1; i <= num; i++) { fact *= i; } printf("Factorial of %d = %llu", num, fact); } return 0; }

#### Output

Factorial of 7 = 5040