TP-02/fibo/fibo.c

#include <stdio.h>
#include "fibo.h"

unsigned long fibo(unsigned long n)
{
    unsigned long first = 0;
    unsigned long second = 1;
    unsigned long t = 0;
    while(n>0)
    {
        n--;
        t = first + second;
        first = second;
        second = t;
    }
    return first;
}