fibonacci.c

#include <stdio.h>

double fib(int num) 
{
    if (num <= 1)
        return 1;
    else
        return fib(num-1) + fib(num-2);
}

int main(int argc, char *argv[])
{
    printf("%.0f\n", fib(atoi(argv[1])));
    return 0;
}