Factorial Recursion Program using C Programming Language

 #include   <stdio.h>

long   int  recursiveFactorial( long   int  input);

int  main() {

long   int  number, result;

printf( "Factorial of a number: \n" );

printf( "\n" );

printf( "Enter a Whole Number: \n" );

scanf( "%ld" ,&number);

printf( "\n" );

result = recursiveFactorial(number);

if  (result == -1) {

printf( "Invalid Input \n" );

}

else  {

printf( "(%ld)! = %ld \n" , number, result);

}

printf( "\n" );

return  0;

}

long   int  recursiveFactorial( long   int   input )

{

if  ( input  < 0) {

return  -1;

}

return  ( input  ? ( input *recursiveFactorial( input  - 1)) : 1);

}