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| <H2>18.4 Example Program: Exceptions</H2> |
| <BLOCKQUOTE><HR><B> |
| NOTE -- This program is in the file exceptn.cpp. |
| </B><HR></BLOCKQUOTE> |
| <A NAME="idx428"><!></A> |
| <P>This following example program demonstrates the use of exceptions:</P> |
| |
| <UL><PRE> |
| #include <stdexcept> |
| #include <string> |
| |
| static void f() { throw std::runtime_error("a runtime error"); } |
| |
| int main () |
| { |
| std::string s; |
| |
| // First we'll try to incite then catch an exception |
| // from the C++ Standard Library string class. |
| // We'll try to replace at a position that is non-existent. |
| // |
| // By wrapping the body of main in a try-catch block we can be |
| // assured that we'll catch all exceptions in the exception |
| // hierarchy. You can simply catch an exception as is done |
| // below, or you can catch each of the exceptions in which |
| // you have an interest. |
| try |
| { |
| s.replace(100,1,1,'c'); |
| } |
| catch (const std::exception& e) |
| { |
| std::cout << "Got an exception: " << e.what() << std::endl; |
| } |
| |
| // Now we'll throw our own exception using the function |
| // defined above. |
| try |
| { |
| f(); |
| } |
| catch (const std::exception& e) |
| { |
| std::cout << "Got an exception: " << e.what() << std::endl; |
| } |
| |
| return 0; |
| } |
| </PRE></UL> |
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