Void Function or Void Method

The method which doesn't return any value is known as void method. This is also known as void Function since method is the other name for function. In order to declare void method, we need to use void keyword before the method name. In order to understand this clearly let us study this with a code example.

CODE

EG 1 . Creating void method and trying to store inside variable, printing out in console and doing arithmetic Calculation.

#include <iostream>
using namespace std;

void PrintRightAngleTraingleShape(int row);

int main(){
    //storing void method inside a variable
    double add = PrintRightAngleTraingleShape(3);
    //printing out void method in console
    cout << PrintRightAngleTraingleShape(3) << endl;
    //Arithmetic Calculation in void method.
    PrintRightAngleTraingleShape(3) * 2 / 180;

    //(Ultimate goal)Printing Right angle triangle shape
    PrintRightAngleTraingleShape(10);
}
void PrintRightAngleTraingleShape(int row) {
    for (int i=1;i<=row;i++) {
        for (int j=1;j<=i;j++) {
        cout << "*";
    }
    cout << endl;
    }
}

OUTPUT
(if we remove all errors)
*
**
***
****
*****
******
*******
********
*********
**********

CODE EXPLANATION
Try executing above codes in visual studio, we going to get error in first 3 lines of code in main method. Just because void method doesn't return any value, that method cannot be written inside cout, that method cannot be stored inside a variable, that method cannot be worked with any operations. If its a void method, the maximum thing we can do with that particular method is invoking. We going to study where to use this void method in our next article Returning Function.

Exercises
Practise the exercises given in previous articles Method or Function, Passing Parameter and Method overloading


(Click Here, For more exercises)