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C++ Introduction
course content

Kursinnehåll

C++ Introduction

C++ Introduction

1. Getting Started
Introduction to C++ ProgrammingEntry Point of a C++ Program Understanding the Standard Library and Files in C++Exploring C++ Preprocessor DirectivesWriting Your First C++ Program
2. Introduction to Operators
Mastering C++ OperatorsArithmetic Operators PracticeRelational OperatorsLogical Operators
3. Variables and Data Types
Data TypesUnderstanding VariablesNumerical Data TypesIntroduction to StringIntroduction to ArraysWorking with the Array
4. Introduction to Program Flow
Conditional StatementsTernary OperatorSwitch StatementWhile LoopFor LoopPracticing With Loops
5. Introduction to Functions
What are Functions?Type of FunctionsReturn Statement in Functions Simple Function Practice

book
Return Statement in Functions

The return statement terminates the execution of a function and returns a value of a predefined type.

h

function

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int func() // int - predefined
{
    int variable = 10; 
	return variable; // variable = 10
}

If the type is specified incorrectly, the function will behave unpredictably.

cpp

main

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#include <iostream>

unsigned short func() 
{
	return -10;
}

//The unsigned short data type has no negative values.

int main()
{
	std::cout << func() << std::endl;
}

That is, before creating a function, the type of data that it returns must be specified. Also, in C++, there are special void functions. Functions of this data type are allowed to return nothing:

cpp

first_example

cpp

second_example

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#include <iostream>

void voidFunction()
{
	std::cout << "It's void function!" << std::endl;

	//function without return
}

int main()
{
	voidFunction();
}

There can be multiple returns inside functions, and each one will only fire under certain conditions.

cpp

main

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#include <iostream>

int func()
{
	int a = 50;
	int b = 6;

	if (a > b) //if a > b, func will return a
	{
		return a;
	}
	else       //otherwise func will return b
	{
		return b;
	}
}

int main()
{
	std::cout << func() << std::endl; //func calling
}

If there are two returns, the second return function will be ignored:

cpp

main

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#include <iostream>

int func()
{
	int a = 50;
	int b = 6;

	return a;
	return b;
}

int main()
{
	std::cout << func() << std::endl; //func calling
}

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