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a guest Jun 19th, 2019 55 Never
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  1. #include<iostream>
  2. #include<vector>
  3.  
  4. using namespace std;
  5.  
  6. class exc : public exception {
  7. public:
  8.     const char* what() const noexcept {
  9.         return " Error :: Parameter of class must be positive";
  10.     }
  11. };
  12.  
  13. class IsPositive {
  14.     int a;
  15. public:
  16.     IsPositive(int a);
  17. };
  18.  
  19. // Parameter of class can be positive only
  20. IsPositive::IsPositive(int a) {
  21.     a > 0 ? this->a = a : throw exc();
  22.     cout << " Number = " << a << endl;
  23. }
  24.  
  25. void main() {
  26.     vector<int> V;
  27.  
  28.     // out_of_range
  29.     try {
  30.         V.at(1);
  31.     }
  32.     catch (exception& e) {
  33.         cout << " Out of range :: " << e.what() << endl;
  34.     };
  35.  
  36.     // lenght_error
  37.     try {
  38.         V.reserve(V.max_size() + 1);
  39.     }
  40.     catch (exception& e) {
  41.         cout << " Length error :: " << e.what() << endl;
  42.     };
  43.  
  44.     // withOUT error
  45.     try {
  46.         IsPositive a = 5;
  47.     }
  48.     catch (exception& e) {
  49.         cout << e.what() << endl;
  50.     }
  51.  
  52.     // with error
  53.     try {
  54.         IsPositive a = -5;
  55.     }
  56.     catch (exception& e) {
  57.         cout << e.what() << endl;
  58.     }
  59.     cout << system("pause");
  60. }
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