C++ Tutorial - Prefix and Postfix Operators in C++

In this C++ Tutorial we are going to learn about Prefix and Postfix Operators in C++,

so you can use the increment operator ++ and the decrement operator — before or after

a variable’s name. If the operator was placed before a variables’s name, it is called a

prefix operator and you can use it like this ++num. if the operator was placed after

the variable name it is called Postfix Operator, and you can use it like this num++ .

If you have a simple statement, the operators accomplish the same thing. The num

variable is increased by 1 in both statements.

num++
++num

1 2	num++ ++num

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The usage of Prefix and Postfix Operators in C++ Tutorial becomes apparent in complex expressions

where a variable is being incremented or decremented and assigned to another

variable. The prefix operator occurs before the variable’s value is used in the expression. The

postfix is evaluated after.

So let’s look at this example

int main() {


	//our variable
	int num = 5;


       //increment the variable
	int sum = ++num;


	//print the values 
	cout << num << '\n';
	cout << sum << '\n';





	return 0;
}

int main() {

//our variable

int num = 5;

//increment the variable

int sum = ++num;

//print the values

cout << num << '\n';

cout << sum << '\n';

return 0;

}

After executing the code , the num variable and sum variable both equal to 6. The prefix

operator in ++num causes, num to be incremented from 5 to 6 before it is assigned to sum.

So this will be the result

6
6
Press any key to continue . . .

Press any key to continue . . .

Now let’s look at this example.

#include<iostream>

using namespace std;





int main() {


	//our variable
	int num = 5;

        //increment the variable
	int sum = num++;

	//print the values 
	cout << num << '\n';
	cout << sum << '\n';





	return 0;
}

#include<iostream>

using namespace std;

int main() {

//our variable

int num = 5;

//increment the variable

int sum = num++;

//print the values

cout << num << '\n';

cout << sum << '\n';

return 0;

}

The result of sum is equal to 5 and num is equal to 6. The postfix operator causes num to be assigned to sum before it is incremented from 5 to 6.

So this will be the result.

6
5
Press any key to continue . . .

Press any key to continue . . .

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