C Program to Calculate Factorial of A Number

Program :-

#include < stdio.h >
main() {
    int n,i = 1,fact = 1;
    printf("\n enter the number :");
    scanf("%d",&n);
    for(;i < = n; i++){
        fact = fact * i ;
    }
    printf("%d!=%d",n,fact);
}

Output :-

enter the number  :  3
3! = 6

Algorithm to Calculate Factorial of A Number

Step 1 : Start

Step 2 : Read Number ,Set i = 1, Factorial = 1

Step 3 : if  i < = Number then go to Step 4
             else go to Step 7

Step 4 : Factorial = Factorial * i

Step 5 : Increment i 

Step 6 : go to Step 3

Step 7 : Print Factorial

Step 8 : Stop