ft_sqrt.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_sqrt.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: unite <marvin@42.fr>                       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/09/20 21:48:17 by unite             #+#    #+#             */
/*   Updated: 2020/07/16 02:52:47 by unite            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
int ft_sqrt(int num)
{
    int factor;
 
    if (num < 0 ||
        (num % 2 == 0 && num % 4 != 0) ||
        (num % 3 == 0 && num % 9 != 0))
        return (-1);
    factor = (num % 2) ? 1 : 0;
    while (factor < num / 2)
    {
        if (factor * factor == num)
            return (factor);
        factor += 2;
    }
    return (-1);
}