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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <math.h>
  4.  
  5. const char* units[] = {"", "один", "два", "три", "четыре", "пять", "шесть", "семь", "восемь", "девять",
  6.                       "десять", "одиннадцать", "двенадцать", "тринадцать", "четырнадцать", "пятнадцать",
  7.                       "шестнадцать", "семнадцать", "восемнадцать", "девятнадцать"};
  8. const char* tens[] = {"", "", "двадцать", "тридцать", "сорок", "пятьдесят", "шестьдесят", "семьдесят",
  9.                      "восемьдесят", "девяносто"};
  10. const char* hundreds[] = {"", "сто", "двести", "триста", "четыреста", "пятьсот", "шестьсот", "семьсот",
  11.                          "восемьсот", "девятьсот"};
  12.  
  13. void get_rubles_form(int n, char* result) {
  14.     if (n % 100 >= 11 && n % 100 <= 19) strcpy(result, "рублей ");
  15.     else switch(n % 10) {
  16.         case 1: strcpy(result, "рубль "); break;
  17.         case 2: case 3: case 4: strcpy(result, "рубля "); break;
  18.         default: strcpy(result, "рублей ");
  19.     }
  20. }
  21.  
  22. void convert_three_digits(int num, int is_thousands, char* result) {
  23.     result[0] = '\0';
  24.     if (num == 0) return;
  25.  
  26.     int hundred = num / 100;
  27.     int rem = num % 100;
  28.  
  29.     if (hundred > 0) {
  30.         strcat(result, hundreds[hundred]);
  31.         strcat(result, " ");
  32.     }
  33.     if (rem < 20) {
  34.         if (rem > 0) {
  35.             const char* word = units[rem];
  36.             if (is_thousands) {
  37.                 if (rem == 1) word = "одна";
  38.                 else if (rem == 2) word = "две";
  39.             }
  40.             strcat(result, word);
  41.             strcat(result, " ");
  42.         }
  43.     } else {
  44.         strcat(result, tens[rem / 10]);
  45.         strcat(result, " ");
  46.         int unit = rem % 10;
  47.         if (unit > 0) {
  48.             const char* word = units[unit];
  49.             if (is_thousands && unit == 1) word = "одна";
  50.             else if (is_thousands && unit == 2) word = "две";
  51.             strcat(result, word);
  52.             strcat(result, " ");
  53.         }
  54.     }
  55. }
  56.  
  57. void number_to_words(double amount, char* output) {
  58.     output[0] = '\0';
  59.     long rubles = (long)amount;
  60.     int kopecks = (int)round((amount - rubles) * 100);
  61.  
  62.     if (rubles == 0) strcat(output, "ноль рублей ");
  63.     else {
  64.         char part[100];
  65.         int millions = rubles / 1000000;
  66.         rubles %= 1000000;
  67.         int thousands = rubles / 1000;
  68.         rubles %= 1000;
  69.  
  70.         if (millions > 0) {
  71.             convert_three_digits(millions, 0, part);
  72.             strcat(output, part);
  73.             if (millions % 100 >= 11 && millions % 100 <= 14) strcat(output, "миллионов ");
  74.             else switch(millions % 10) {
  75.                 case 1: strcat(output, "миллион "); break;
  76.                 case 2: case 3: case 4: strcat(output, "миллиона "); break;
  77.                 default: strcat(output, "миллионов ");
  78.             }
  79.         }
  80.         if (thousands > 0) {
  81.             convert_three_digits(thousands, 1, part);
  82.             strcat(output, part);
  83.             if (thousands % 100 >= 11 && thousands % 100 <= 14) strcat(output, "тысяч ");
  84.             else switch(thousands % 10) {
  85.                 case 1: strcat(output, "тысяча "); break;
  86.                 case 2: case 3: case 4: strcat(output, "тысячи "); break;
  87.                 default: strcat(output, "тысяч ");
  88.             }
  89.         }
  90.         if (rubles > 0) {
  91.             convert_three_digits(rubles, 0, part);
  92.             strcat(output, part);
  93.             char rub_form[20];
  94.             get_rubles_form(rubles, rub_form);
  95.             strcat(output, rub_form);
  96.         }
  97.     }
  98.  
  99.     char kop_str[3];
  100.     sprintf(kop_str, "%02d", kopecks);
  101.     strcat(output, kop_str);
  102.     strcat(output, " копеек.");
  103.  
  104.     // Удаление двойных пробелов
  105.     char* pos;
  106.     while ((pos = strstr(output, "  ")) != NULL) 
  107.         memmove(pos, pos + 1, strlen(pos));
  108. }
  109.  
  110. int main() {
  111.     double amount;
  112.     printf("Введите сумму: ");
  113.     scanf("%lf", &amount);
  114.     char result[500];
  115.     number_to_words(amount, result);
  116.     printf("%s\n", result);
  117.     return 0;
  118. }
  119.  
Success #stdin #stdout 0.01s 5272KB
comments (?)
stdin 
Standard input is empty
stdout 
Введите сумму: ноль рублей 00 копеек.
https://ideone.com/we6teU
language:
C (gcc 8.3)
created:
12 days ago
visibility:
public

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