fib.c

#include <stdio.h>
 
int fib(n) {
    if ((n == 0)||(n == 1)) {
        return n;
    } else {
        return fib(n-1) + fib(n-2);
    }
}
 
int main (int argc, char const *argv[])
{
    int i;
    for (i = 0; i < 36; i++) {
        printf("n = %d => %d\n", i, fib(i));
    }
    return 0;
}