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  1. #include <thread>
  2. #include <iostream>
  3. #include <mutex>
  4.  
  5. std::once_flag flag;
  6. const size_t arraySize = 1000;
  7. int array[arraySize];
  8. void fillWithRandomNumbers()
  9. {
  10.     std::srand(time(0));
  11.     for (size_t index = 0; index < arraySize; ++index)
  12.         array[index] = (rand() % 999 + 1);
  13. }
  14.  
  15. void countEvenAndOddNumbers(int counter[2])
  16. {
  17.     std::call_once(flag, fillWithRandomNumbers);
  18.  
  19.     counter[0] = 0;
  20.     counter[1] = 0;
  21.  
  22.     for (size_t index = 0; index < arraySize; ++index)
  23.         ++counter[array[index] & 1];
  24. }
  25.  
  26.  
  27. int summ(int num)
  28. {
  29.     int sum = 0;
  30.     while (num != 0)
  31.     {
  32.         sum += num % 10;
  33.         num /= 10;
  34.     }
  35.     return sum;
  36. }
  37. void findDivisibleByThree(int* result, int* counter)
  38. {
  39.     std::call_once(flag, fillWithRandomNumbers);
  40.     *counter = 0;
  41.     for (size_t index = 0; index < arraySize; ++index)
  42.     {
  43.         if ((summ(index) % 3) == 0)
  44.         {
  45.             result[*counter] = array[index];
  46.             ++*counter;
  47.         }
  48.     }
  49. }
  50.  
  51. void countDivisibleByFiveOrSeven(int* count)
  52. {
  53.     std::call_once(flag, fillWithRandomNumbers);
  54.     *count = 0;
  55.     for (size_t index = 0; index < arraySize; ++index)
  56.     {
  57.         if ((((array[index] % 5) == 0)) || ((array[index] % 7) == 0))
  58.             ++*count;
  59.     }
  60. }
  61.  
  62. int main()
  63. {
  64.     int array[arraySize];
  65.     int counter[2];
  66.     int count = 0;
  67.     int cou = 0;
  68.     std::thread t1(countEvenAndOddNumbers, counter);
  69.     std::thread t2(findDivisibleByThree , array, &cou);
  70.     std::thread t3(countDivisibleByFiveOrSeven, &count);
  71.     t1.join();
  72.     t2.join();
  73.     t3.join();
  74.  
  75.     std::cout << "Even- " << counter[0] << "\n";
  76.     std::cout << "Odd- " << counter[1] << "\n";
  77.     std::cout << "EntireThree- " << cou << "\n";
  78.     std::cout << "EntireFiveOrSeven- " << count << "\n";
  79.  
  80.     return 0;
  81. }
  82.  
Success #stdin #stdout 0s 21400KB
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stdin
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Standard input is empty
stdout
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Even- 503
Odd- 497
EntireThree- 334
EntireFiveOrSeven- 334
https://ideone.com/itZBha
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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