Hey all, Programming newbie here.

I'm programming the Fibbonacci code, but I can't figure out how to set the condition

"if NOT EQUAL to any numerical value"

This is what I have so far:

Thanks for the help in advance!Code:#include <stdio.h> #include <conio.h> long fib(int); int main() { int n; printf("Enter the Fibbonacci number you would like to view: "); scanf("%i", &n); if (WHAT GOES HERE?) { printf("Input error.\n"); getch(); } else if (n<0) { printf("Fibonacci is undefined for negative integers.\n"); getch(); } else { printf("The %i-th Fibonacci number is %ld\n", n, fib(n)); } getch(); return 0; } long fib(int n) { if (n == 1 || n == 2) { return 1; } else { return (fib(n-1) + fib(n-2)); } }