Standard C++ Library User Guide and Tutorial

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Example Program

Obtaining the Sample Program.

This following example program demonstrates the use of exceptions.

#include <stdexcept>

#include <string>

static void f() { throw runtime_error("a runtime error"); }

int main ()

{

string s;

// First we'll try to incite then catch an exception from

// the 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 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 exception& e)

{

cout << "Got an exception: " << e.what() << endl;

}

// Now we'll throw our own exception using the function

// defined above.

try

{

f();