1.3 KiB
1.3 KiB
title |
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Error Handling |
C++ Exception Handling
An exception is a problem that arises during the execution of a program.Exceptions provide a way to transfer control from one part of a program to another. C++ exception handling is built upon three keywords: #try, #catch, and #throw.
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#throw − A program throws an exception when a problem shows up. This is done using a throw keyword.
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#catch − A program catches an exception with an exception handler at the place in a program where you want to handle the problem. The catch keyword indicates the catching of an exception.
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#try − A try block identifies a block of code for which particular exceptions will be activated. It's followed by one or more catch blocks.
#include <iostream>
using namespace std;
int main()
{
int x = -1;
// Some code
cout << "Before try \n";
try {
cout << "Inside try \n";
if (x < 0)
{
throw x;
cout << "After throw (Never executed) \n";
}
}
catch (int x ) {
cout << "Exception Caught \n";
}
cout << "After catch (Will be executed) \n";
return 0;
}
Before you go on...
A review
- Grouping of Error Types.
- Separation of Error Handling code from Normal Code.
- Functions/Methods can handle any exceptions they choose.