Algorithm to find factorial of input number from user in C language

Program To Find Factorial Of Any Number in " C" Language

/* factorial of a number */
# include <stdio.h>
void main ()
{
int a ;
fact = 1;
clrscr () ;
printf ("\n enter a number:") ;
scanf ("%d", & a) ;
while ( a!=0 )
{
fact = fact*a ;
a-- ;
}
printf ("\n factorial of %d =%d", a,fact) ;
getch () ;
}

Output in c :

Enter a number : 4

factorial : 4 * 3 * 2 * 1 = 24

Enter a number : 6

factorial : 6 * 5 * 4 * 3 * 2 * 1 = 720

ALGORITHM :  TO FIND FACTORIAL OF A NUMBER INPUT FROM USER IN C

                         This is a program for calculation of factorial of a number input from user in c.

STEP 1. START.

STEP 2. SET FACT = 1.

STEP 3. INPUT A NUMBER SAY A.

STEP 4. { CHECK FOR CONDITION }

               A ! = 0.

            { HERE A ! = 0 BECAUSE FACTORIAL IS ALWAYS MULTIPLE OF MAXIMUM OF THE GIVEN NUMBER TO ONE}

STEP 5. FACT = FACT * A.

STEP 6. A = A - 1.

STEP 7. PRINT VALUE OF FACT.

STEP 8. STOP.