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  1. #include <iostream>
  2. #include <iomanip>
  3.  
  4.  
  5. int plus5(int arg) {
  6.    return arg + 5;
  7. }
  8.  
  9. int multiply3(int arg) {
  10.    return 3 *arg;
  11. }
  12.  
  13. typedef int (*function_t)(int);
  14.  
  15. void for_each(int * begin, int * end, function_t func) {
  16.    for ( ; begin != end; ++begin) {
  17.       *begin = func(*begin);
  18.    }
  19. }
  20.  
  21.  
  22. int main() {
  23.    std::size_t const size = 5;
  24.    int array[] = {1, 2, 3, 4, 5};
  25.  
  26.    std::cout << "add 5 to each element:     ";
  27.    for_each(array, array + size, plus5);
  28.    for (std::size_t i = 0; i != size; ++i) {
  29.       std::cout << std::setw(4) << array[i];
  30.    }
  31.    std::cout << std::endl;
  32.  
  33.    std::cout << "multiply each element by 3: ";
  34.    for_each(array, array + size, multiply3);
  35.    for (std::size_t i = 0; i != size; ++i) {
  36.       std::cout << std::setw(4) << array[i];
  37.    }
  38.    std::cout << std::endl;
  39. }
  40.  
Success #stdin #stdout 0s 2896KB
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stdin
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Standard input is empty
stdout
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add 5 to each element:        6   7   8   9  10
multiply each element by 3:   18  21  24  27  30
https://ideone.com/NYkeVf
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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