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# C Program A User-Defined Function to Find Factorial of a Number

by Dinesh Thakur Category: C Programming (Pratical)

In this example, a for loop is used to determine the factorial of a given number, a. The variable a itself is used as the loop variable. As the value of variable a will be initialized when the scanf statement is executed, the initial expression in the for loop is not required and is omitted.

Note that we have avoided a separate loop variable, reducing the memory requirement of this program. However, the original value of variable a is not available after the loop is executed. This approach is particularly suitable in a function that calculates and returns the value of factorial of a given number.

```#include <stdio.h>#include <conio.h>void main (){           int a;           long f,fact();           clrscr();           printf ("\n Enter a Number : ");           scanf ("%d",&a);           f=fact(a);           printf ("\n The Factorial of %d is : %ld",a,f);           getch();}       long fact(int b) {     int i;     long f=1;     for (i=1;i<=b;i++)            f=f*i;            return(f);}Output :Enter a Number : 5The Factorial of 5 is : 120
```

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