Fibonacci For n*th number Program using C programming Language

 #include   <stdio.h>

long  recursiveFibonacci( long  number);

int  main() {

long  nthNumber;

printf( "nth Fibonacci : \n" );

printf( "\n" );

printf( "nth Number = " );

scanf( "%d" ,&nthNumber);

printf( "\n" );

long  nthFibonacci = recursiveFibonacci(nthNumber);

if  (nthFibonacci == -1) {

printf( "Invalid Input \n" );

printf( "\n" );

}

else  {

printf( "fibonacci(%d) = %d \n" , nthNumber, nthFibonacci);

printf( "\n" );

}

return  0;

}

long  recursiveFibonacci( long   number ) {

if  ( number  < 0) {

return  -1;

}

else   if  (! number ) {

return  0;

}

else   if  ( number  == 1) {

return  1;

}

else  {

return  (recursiveFibonacci( number  - 1) + recursiveFibonacci( number  - 2));

}

}