Ecrire_en_lettre

/****** IN C LANGUAGE *************/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>

char* itoa(int val, int base)
{

    static char buf[32] = {0};

    int i = 30;

    for(; val && i ; --i, val /= base)

        buf[i] = "0123456789abcdef"[val % base];

    return &buf[i+1];

}

void helper(int n)
{
    char *number;
    int i;
    int len;
    char copy[20];
    int slice;

    static char *str1[] = {
        "\0", "one", "two", "three", "four", "five", "six", "seven",
        "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen", "twenty"
    };

    static char *str2[] = {"\0", "\0", "twenty", "firty", "fourty", "fifty", "sixty", "seventy", "eighty", "ninety", "hundreds", "thousands", "millions", "billions"
    };

    static char *str3[] = {"\0", "\0", "\0", "hundred", "thousands","millions", "billions"
    };

    number = itoa(n, 10);
    len = strlen(number);
    slice = (int)(ceil(len/3.0));
    printf("%d : ", n);
    i = -1;
    while (++i < len)
    {
        if (slice == 1)
        {
            if (len == 1)
                printf("%s ", str1[number[i] - '0']);
            if (len == 2)
            {
                if (n < 21)
                {
                    printf("%s", str1[n]);
                    break;
                }
                else
                {
                    if (i == 0)
                    printf("%s ", str2[number[i] - '0']);
                    else
                        printf("%s",str1[number[i] - '0']);
                }
            }
            else if (len == 3)
            {
                if (i == 0)
                    printf(" %s %s", str1[number[i] - '0'], str3[len]);
                else if (i == 1)
                    printf(" %s ", str2[number[i] - '0']);
                else
                    printf("%s ",str1[number[i] - '0']);
            }
        }/////
        else if (slice == 2)
        {
            if (len == 4)
            {
                if (i == 0)
                    printf(" %s %s", str1[number[i] - '0'], str3[len]);
                else if (i == 1)
                    printf(" %s %s", str1[number[i] - '0'], str3[len -1]);
                else if (i == 2)
                    printf(" %s", str2[number[i] - '0']);
                else if (i == 3)
                    printf(" %s", str1[number[i] - '0']);
            }
            else if (len == 5)
            {
                if (i == 0)
                    printf(" %s", str2[number[i] - '0']);
                else if (i == 1)
                    printf(" %s %s", str1[number[i] - '0'] , str3[len -1]);
                else if (i == 2)
                    printf(" %s %s", str1[number[i] - '0'], number[i] - '0'?str3[len - 2]: "\0");
                else if (i == 3)
                    printf(" %s", str2[number[i] - '0']);
                else if (i == 4)
                    printf(" %s", str1[number[i] - '0']);
            }
            else if (len == 6)
            {
                printf("%s ",str1[number[i] - '0']);
            }
        }////////////
        else if (slice == 3)
        {
            if (len == 7)
            {
                if (i == 0)
                    printf(" %s %s", str1[number[i] - '0'], str3[len - 2]);
                else if (i == 1)
                    printf(" %s %s", str1[number[i] - '0'],  str3[len -4]);
                else if (i == 2)
                    printf(" %s %s", str2[number[i] - '0'], str3[len - 3]);
                else if (i == 3)
                    printf(" %s %s", str1[number[i] - '0'], str3[len - 5]);
                else if (i == 4)
                    printf(" %s %s", str1[number[i] - '0'], str3[len-4]);
                else if (i == 5)
                    printf(" %s ", str2[number[i] - '0']);
                else
                    printf("%s ",str1[number[i] - '0']);
            }
            else if (len == 8)
            {
                if (i == 0)
                    printf(" %s", str2[number[i] - '0']);
                else if (i == 1)
                    printf(" %s %s", str1[number[i] - '0'],  str3[len -3]);
                else if (i == 2)
                    printf(" %s %s", str1[number[i] - '0'], str3[len - 5]);
                else if (i == 3)
                    printf(" %s", str1[number[i] - '0']);
                else if (i == 4)
                    printf(" %s %s", str1[number[i] - '0'], str3[len-4]);
                else if (i == 5)
                    printf(" %s %s", str1[number[i] - '0'], str3[len - 5]);
                else if (i == 6)
                    printf(" %s",str2[number[i] - '0']);
                else
                    printf(" %s ",str1[number[i] - '0']);
            }////
            else if (len == 9)
            {
                if (i == 0)
                    printf(" %s %s", str1[number[i] - '0'], str3[len - 6]);
                else if (i == 1)
                    printf(" %s ", str2[number[i] - '0']);
                else if (i == 2)
                    printf(" %s %s", str1[number[i] - '0'], str3[len - 4]);
                else if (i == 3)
                    printf(" %s %s", str1[number[i] - '0'], number[i] - '0' ? str3[len -6]: "\0");
                else if (i == 4)
                    printf(" %s ", str2[number[i] - '0']);
                else if (i == 5)
                    printf(" %s %s", str1[number[i] - '0'], str3[len - 5]);
                else if (i == 6)
                    printf(" %s %s",str1[number[i] - '0'], str3[len - 6]);
                else if (i == 7)
                    printf(" %s ",str2[number[i] - '0']);
                else if (i == 8)
                    printf(" %s ",str1[number[i] - '0']);
            }
        }
        else if (slice == 4)
        {
            if (len == 10)
            {
                if (i == 0)
                    printf(" %s %s", str1[number[i] - '0'], str3[len - 4]);
                if (i == 1)
                    printf(" %s %s", str1[number[i] - '0'], str3[len - 7]);
                else if (i == 2)
                    printf(" %s ", str2[number[i] - '0']);
                else if (i == 3)
                    printf(" %s %s", str1[number[i] - '0'], str3[len - 5]);
                else if (i == 4)
                    printf(" %s %s", str1[number[i] - '0'], number[i] - '0' ? str3[len -7]: "\0");
                else if (i == 5)
                    printf(" %s ", str2[number[i] - '0']);
                else if (i == 6)
                    printf(" %s %s", str1[number[i] - '0'],str3[len - 6]);
                else if (i == 7)
                    printf(" %s %s",str1[number[i] - '0'], str3[len - 7]);
                else if (i == 8)
                    printf(" %s ",str2[number[i] - '0']);
                else if (i == 9)
                    printf(" %s ",str1[number[i] - '0']);
            }
        }
    }
    printf("\n---------------------------------------------------------\n");
}

int             main(int argc, char **argv)
{
    int         i;
    printf("\n---------WRITTEN IN C-LANGUAGE-------------------");
    printf("\n---------J'ECRIS EN LETTRE JUSQU'AU MILLIARD------------------- \n");
    if(argc > 1)
    {
        i = 1;
        while(argv[i])
        {
            helper(atoi(argv[i++]));
        }
    }
    return(0);
}