53 lines
1.6 KiB
Markdown
53 lines
1.6 KiB
Markdown
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---
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title: Functions in C++
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---
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## Definition:
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A function is a group of statements that together perform a task. Every C++ program has at least one function, which is main().
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A function declaration tells the compiler about a function's name, return type, and parameters. A function definition provides the actual body of the function.
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## The general form of a C++ function definition:
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```cpp
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return_type function_name( parameter list )
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{
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body of the function
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}
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```
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### Return type:
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A function may return a value. The return_type is the data type of the value the function returns. Some functions perform the desired operations without returning a value. In this case, the return_type is the keyword void.
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### Function name:
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This is the actual name of the function. The function name and the parameter list together constitute the function signature.
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### Parameters:
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A parameter is like a placeholder. When a function is invoked, you pass a value to the parameter. This value is referred to as actual parameter or argument. The parameter list refers to the type, order, and number of the parameters of a function. Parameters are optional; that is, a function may contain no parameters.
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### Function body:
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The function body contains a collection of statements that define what the function does.
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##Example:
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```cpp
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int max(int num1, int num2)
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{
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// local variable declaration
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int result;
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if (num1 > num2)
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result = num1;
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else
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result = num2;
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return result;
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}
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```
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## More Information
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* [TutorialsPoint](https://www.tutorialspoint.com/cplusplus/cpp_functions.htm)
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