43 lines
1.3 KiB
Markdown
43 lines
1.3 KiB
Markdown
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---
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title: Error Handling
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---
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# C++ Exception Handling
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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.
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```CPP
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#include <iostream>
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using namespace std;
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int main()
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{
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int x = -1;
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// Some code
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cout << "Before try \n";
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try {
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cout << "Inside try \n";
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if (x < 0)
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{
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throw x;
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cout << "After throw (Never executed) \n";
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}
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}
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catch (int x ) {
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cout << "Exception Caught \n";
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}
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cout << "After catch (Will be executed) \n";
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return 0;
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}
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```
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# Before you go on...
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## A review
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* Grouping of Error Types.
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* Separation of Error Handling code from Normal Code.
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* Functions/Methods can handle any exceptions they choose.
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