How To Raise a Number To the Second Power in Java

January 22, 2018January 22, 2018 Vertex Academy how to raise a number to a power java, how to raise a number to a power java without math.pow, how to raise a number to the second power in java

This is one of the articles from our Java Tutorial for Beginners.

Your Task:

To write a method, raising a number to the second power. For example:

Then you have to add the number 2 to the result.

For example:

if a user types in the number 2, then the numbers 4 and 6 have to be displayed in the console
if a user types in the number 3, then the numbers 9 and 11 have to be displayed in the console
if a user types in the number 5, then the numbers 25 and 27 have to be displayed in the console
etc.

Solution - 1st approach:

public class Test{
    static int square(int a){
        int result = a*a;
        return result;
    }    
 
 
    public static void main(String[] args){
        int a1 = square(5); 
        System.out.println(a1);
        System.out.println(a1 + 2);
        
    }
}

public class Test{

static int square(int a){

int result = a*a;

return result;

}

public static void main(String[] args){

int a1 = square(5);

System.out.println(a1);

System.out.println(a1 + 2);

}

If you run this code on your computer, you will see the following in your console:

Commentary:

First of all, you have to find out the formula of raising a number to the second power. As you see, the formula will look like this a*a:

That's why we wrote a method called square() with the help of these lines of code:

static int square(int a){
		int result = a*a;
		return result;

static int square(int a){

int result = a*a;

return result;

And in this line of the code we get a number, that will be raised to the second power. Please note, that the number has to be an integer, as we wrote in the code int a:

static int square(int a)

1	static int square(int a)

Then to multiply the number by itself, we wrote this line:

int result = a*a;

1	int result = a*a;

And then we call the method square():

public static void main(String[] args){
        int a1 = square(5); 
        System.out.println(a1);
        System.out.println(a1 + 2);
        
    }

public static void main(String[] args){

int a1 = square(5);

System.out.println(a1);

System.out.println(a1 + 2);

}

As you can see, in this case we raise the number 5 to the second power. As a result, we get 25 and we assign 25 to the variable called a1.

int a1 = square(5);

1	int a1 = square(5);

Then with the help of

System.out.println(a1);

1	System.out.println(a1);

the number 25 will be displayed in the console.

And then with the help of

System.out.println(a1 + 2);

1	System.out.println(a1 + 2);

the number 27 wil be displayed in the console.

Solution - the 2nd approach

public class Test{
    static int square(int a){
        return a*a;
    }    
    
    public static void main(String[] args){
        System.out.println( square(5) );
        System.out.println( square(5) + 2 );
    }
}

public class Test{

static int square(int a){

return a*a;

}

public static void main(String[] args){

System.out.println( square(5) );

System.out.println( square(5) + 2 );

}

Commentary:

In this approach, unlike the 1st approach described above, this part of code

static int square(int a){
        int result = a*a;
        return result;
    }

static int square(int a){

int result = a*a;

return result;

}

has been replaced with

static int square(int a){
		return a*a;
	}

static int square(int a){

return a*a;

}

So the formula of raising a number to the second power (a*a) has been written next to "return".

And these lines of code from the 1st approach

public static void main(String[] args){
        int a1 = square(5); 
        System.out.println(a1);
        System.out.println(a1 + 2);
        
    }

public static void main(String[] args){

int a1 = square(5);

System.out.println(a1);

System.out.println(a1 + 2);

}

have been replaced with

public static void main(String[] args){
		System.out.println( square(5) );
		System.out.println( square(5) + 2 );
	}

public static void main(String[] args){

System.out.println( square(5) );

System.out.println( square(5) + 2 );

}

Thefore, we've got fewer lines of code. And still it is an easy-to-read code.

You can find more articles in our Java Tutorial for Beginners.

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