92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* ft_itoa.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: hulamy <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2019/11/25 13:59:01 by hulamy #+# #+# */
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/* Updated: 2020/02/19 15:44:04 by hulamy ### ########.fr */
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/* */
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/* ************************************************************************** */
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/*
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** take an integer and give a string
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*/
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/*
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** #include <stdio.h> // for printf
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** #include <stdlib.h> // for atoi
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**
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** char *ft_itoa(long int n);
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**
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** int main(int ac, char **av)
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** {
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** if (ac == 0)
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** return (0);
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** else if (ac == 2)
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** printf("%s\n",ft_itoa(atoi(av[1])));
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** else
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** {
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** long int i;
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** i = 0;
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** printf(" %li\n %s\n\n",i,ft_itoa(i));
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** i = 1234567;
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** printf(" %li\n %s\n\n",i,ft_itoa(i));
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** i = -1234567;
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** printf(" %li\n %s\n\n",i,ft_itoa(i));
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** i = 237683;
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** printf(" %li\n %s\n\n",i,ft_itoa(i));
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** i = 2147483647;
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** printf("| %li\n| %s\n\n",i,ft_itoa(i));
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** i = i ^ 0; // create the opposite of a signed '0', which
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** // is 0 followed by 31 '1', the signed int max
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** printf("* %li\n* %s\n\n",i,ft_itoa(i));
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** i = i ^ 0;
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** i = 1 << 31; // change the most lefted bit from '0' (positive)
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** // to '1' (negative), the signed int min
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** printf("* %li\n* %s\n\n",i,ft_itoa(i));
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** i = 2147483646;
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** printf(" %li\n %s\n\n",i,ft_itoa(i));
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** i = -2147483648;
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** printf("| %li\n| %s\n\n",i,ft_itoa(i));
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** i = -2147483647;
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** printf(" %li\n %s\n\n",i,ft_itoa(i));
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** i = 2147483648;
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** printf(" %li\n %s\n\n",i,ft_itoa(i));
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** i = -2147483649;
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** printf(" %li\n %s\n\n",i,ft_itoa(i));
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** i = 9223372036854775807;
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** printf("| %li\n| %s\n\n",i,ft_itoa(i));
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** i = -9223372036854775807;
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** printf("| %li\n| %s\n\n",i,ft_itoa(i));
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** }
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** return 0;
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** }
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*/
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#include "libft.h"
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char *ft_itoa(long int n)
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{
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char *str;
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int len;
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long int cpy;
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char rgt;
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cpy = (n < 0) ? (n / 10) * -10 : (n / 10) * 10;
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len = (n < 0) ? 2 : 1;
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rgt = (n < 0) ? (n % 10) * -1 + '0' : n % 10 + '0';
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while (n /= 10)
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len++;
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if (!(str = (char *)malloc(sizeof(char) * (len + 1))))
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return (NULL);
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str[len] = '\0';
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str[--len] = rgt;
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while (cpy /= 10)
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str[--len] = cpy % 10 + '0';
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if (len)
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str[0] = '-';
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return (str);
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}
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