Simple Fibonacci printing using function

fibonacci.c

#include <stdio.h>
#include <stdlib.h>

void fibo(int end);
int main()
{
    fibo (10);
    return 0;
}

void fibo (int end)
{
    int x, first = 0, second = 1;
    for( x= 0; x< end; x++)
    {
        printf("%d %d ",first,second);
        first = first + second;
        second = first + second;
    }
}