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C++ Introduction
course content

Course Content

C++ Introduction

C++ Introduction

1. Getting Started
Why to Learn C++What is C++Entry Point of a ProgramStandard Library and FilesPreprocessor DirectivesThe First Program
2. Variables and Data Types
Introduction to VariablesData TypesNumerical Data TypesIntroduction to StringIntroduction to ArraysKeywords sizeof(), auto and typedefWorking with the Array
3. Introduction to Operators
Simple OperatorsA Little MathLogical OperatorsCompound Assignment OperatorPracticing Math Basics
4. Introduction to Program Flow
If...else StatementTernary OperatorSwitch StatementWhile LoopDo...while LoopFor LoopFibonacci Number with Loops
5. Introduction to Functions
What are Functions?Type of FunctionsReturn Statement in FunctionsFunctions With Arguments Simple Function

bookReturn Statement in Functions

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

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

cpp

main

copy

              
12345678910111213

            
#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

copy

              
12345678910111213

            
#include <iostream>

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

	//function without return
}

int main()
{
	voidFunction();
}

A lot of returns

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

cpp

main

copy

              
123456789101112131415161718192021

            
#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

copy

              
12345678910111213141516

            
#include <iostream>

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

	return a;
	return b;
}

int main()
{
	std::cout << func() << std::endl; //func calling
}
What will the function return?

What will the function return?

Select the correct answer

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Section 5. Chapter 3
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