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  1. #include <iostream>
  2.  
  3. int gcd(int a, int b) {
  4.     return b ? gcd(b, a % b) : a;
  5. }
  6.  
  7. void findGcd(int* couples, int numCouples) {
  8.     for (int i = 0; i < numCouples; i++) {
  9.         printf("GCD of the %d%s%d%s", (i + 1), " couple: ", gcd(couples[2 * i], couples[2 * i + 1]), ".\n");
  10.     }
  11. }
  12.  
  13. int getNumber(int minValue, int maxValue) {
  14.     int number;
  15.     bool isCorrect;
  16.     do {
  17.         isCorrect = true;
  18.         printf("\nEnter: ");
  19.         scanf_s("%d", &number);
  20.         if (number > maxValue || number < minValue) {
  21.             printf("Your value will be more than %d%s%d%s", minValue, " and less than ", maxValue, ". Try again.");
  22.             isCorrect = false;
  23.         }
  24.     } while (!isCorrect);
  25.     return number;
  26. }
  27.  
  28.  
  29. void getCouples(int* couples, int numCouples) {
  30.     for (int i = 0; i < numCouples; i++) {
  31.         printf("Enter %d %s", (i + 1), "couple.");
  32.         printf("\nEnter the first number of this couple.");
  33.         couples[2 * i] = getNumber(1, INT_MAX);
  34.         printf("Enter the second number of this couple.");
  35.         couples[2 * i + 1] = getNumber(1, INT_MAX);
  36.     }
  37. }
  38.  
  39. int main() {
  40.     int couples[50];
  41.     printf("Enter the number of couples.");
  42.     int numCouples = getNumber(1, 25);
  43.     printf("Now enter couples.");
  44.     getCouples(couples, numCouples);
  45.     findGcd(couples, numCouples);
  46. }
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