C/C++ Program To Calculate Factorial Of A Number Using RECURSION.

Before reading the program you should know what is FACTORIAL and RECURSION ????

/* C/C++ Program To Calculate Factorial Of A Number Using RECURSION */

#include<stdio.h>
#include<conio.h>
long factorial(int);   // Function Prototype
void main()
{
int number;
long fact;
clrscr();
printf("Enter a number to find
factorial : );
scanf("%d", &number);
if(number<0 >
printf("Negative numbers are not allowed.\n");
else
{
fact=factorial(num);  // Function Calling
printf("%d! = %ld\n",number,fact);
}
getch();
}

long factorial(int x)  // Function Defination
{
if (x==0)
return 1;
else
return(x* factorial(x-1));  // Function Calling Itself » Recursion
}

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