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C++ Functions
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C++ Functions

C++ Functions

1. Introduction
What is Function in C++?How to Create Function in C++?Simple Function CreationVariable ScopesUnderstanding Variable Scopes
2. Function Arguments Specification
Positional and Default ArgumentsPassing Arguments by Value/Pointer/ReferenceConstant Function ArgumentsPassing Static Array as an Argument of the FunctionPassing Dynamic Array as an Argument of the FunctionWhy Do We Need Array Size as an Argument?Passing Custom Structures as Arguments
3. Function Return Values Specification
Returning Values With Simple Data TypesReturning Arrays from the FunctionReturn Custom Data TypesVoid Return Type
4. Some Advanced Topics
Function OverloadingFunction Overloading PracticeRecursionLambda Functions

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Why Do We Need Array Size as an Argument?

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Why is it necessary to provide the size of the array as an additional argument when using dynamic arrays? The crucial factor is that technically, we are passing not the entire array but the pointer to its first value.

Remember

The compiler does not have information about the size of the array, which can lead to accessing memory beyond the array's boundaries, resulting in unexpected garbage values.

Let's solve a simple task to illustrate it:

  • Pass the dynamic array as the first argument of the function.
  • Call the function inside the main() block and pass the pointer at the first element of the array as the first argument.

Look at the result! Pay attention to the last two values!

Lösning

cpp

solution

Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 6
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book
Why Do We Need Array Size as an Argument?

Uppgift

Swipe to start coding

Why is it necessary to provide the size of the array as an additional argument when using dynamic arrays? The crucial factor is that technically, we are passing not the entire array but the pointer to its first value.

Remember

The compiler does not have information about the size of the array, which can lead to accessing memory beyond the array's boundaries, resulting in unexpected garbage values.

Let's solve a simple task to illustrate it:

  • Pass the dynamic array as the first argument of the function.
  • Call the function inside the main() block and pass the pointer at the first element of the array as the first argument.

Look at the result! Pay attention to the last two values!

Lösning

cpp

solution

Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 6
Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
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