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07_Exceptions_Enums_Structs_and_Classes

07_Exceptions_Enums_Structs_and_Classes - Discussion 7...

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Discussion 7: Exceptions, Enums, Structs, and Classes EECS 280 Monday, October 24th, 2011 1 Exceptions Exceptions allow you to check for and handle errors that occur in functions. They are composed of three parts: Try Blocks allow you to encapsulate code that may throw exceptions Throws used to raise an exception when an error occurs Catch Blocks let the program deal with encountered errors catch blocks can only follow try blocks. The code for try / catch blocks follows this form: 1 int foo (int num) { 2 try { 3 if (num > 0) 4 throw test; 5 else if (num < 0) 6 throw ' n ' ; 7 else 8 throw 3.14; 9 } 10 catch (int i) { // catches ints 11 cout << i << endl; 12 } 13 catch(char c) { // catches characters 14 cout << c << endl; 15 } 16 catch (...) { // catches here otherwise 17 cout << "other" << endl; 18 } 19 return 0; 20 } 1
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Thrown exceptions are passed up the stack until they are caught. If you don’t catch a throw before it escapes main() , your program will exit with an error. 2 Enums Enums allow you to create your own set of labels. For example, in Project 3 you keep track of a card’s type using the
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