Learn Return Statement in Functions | Introduction to Functions

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

function.h


              12345
            
int func() // int - predefined
{
    int variable = 10; 
	return variable; // variable = 10
}

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

main.cpp


              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:

first_example.cpp

second_example.cpp


              12345678910111213
            
#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.

main.cpp


              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:

main.cpp


              12345678910111213141516
            
#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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Section 5. Chapter 3

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

function.h


              12345
            
int func() // int - predefined
{
    int variable = 10; 
	return variable; // variable = 10
}

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

main.cpp


              12345678910111213
            
#include <iostream>

unsigned short func() 
{
	return -10;
}

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

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

first_example.cpp

second_example.cpp


              12345678910111213
            
#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.

main.cpp


              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:

main.cpp


              12345678910111213141516
            
#include <iostream>

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

	return a;
	return b;
}

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

Everything was clear?

Thanks for your feedback!

Section 5. Chapter 3

Return Statement in Functions

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Return Statement in Functions