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## 1. Introduction

In this quick tutorial, we’re going to implement a CLI program to calculate percentage in Java.

But first, let’s define how to calculate percentage mathematically.

## 2. Mathematical Formula

In mathematics, a percentage is a number or ratio expressed as a fraction of 100. It’s often denoted using the percent sign, “%”.

Let’s consider a student that obtains x marks out of total y marks. The formula to calculate percentage marks obtained by that student would be:

percentage = (x/y)*100

## 3. Java Program

Now that we are clear on how to calculate percentage mathematically, let’s build a program in Java to calculate it:

public class PercentageCalculator { public double calculatePercentage(double obtained, double total) { return obtained * 100 / total; } public static void main(String[] args) { PercentageCalculator pc = new PercentageCalculator(); Scanner in = new Scanner(System.in); System.out.println("Enter obtained marks:"); double obtained = in.nextDouble(); System.out.println("Enter total marks:"); double total = in.nextDouble(); System.out.println( "Percentage obtained: " + pc.calculatePercentage(obtained, total)); } }

This program takes the marks of the student (obtained marks and total marks) from CLI and then calls *calculatePercentage()* method to calculate the percentage out of it.

Here we’ve chosen double as a data type for input and output as it could store decimal numbers with up to 16 digits of precision. Hence, it should be adequate for our use case.

## 4. Output

Let’s run this program and see the result:

Enter obtained marks: 87 Enter total marks: 100 Percentage obtained: 87.0 Process finished with exit code 0

## 5. Conclusion

In this article, we took a look at how to calculate percentage mathematically and then wrote a Java CLI program to calculate it.

Finally, as always, the code used in the example is available over on GitHub.

Next post, how to do a sum in Java! Your blog is gorgeous but sometimes you should filter these type of posts…

🙂 Some posts are addressed to more beginner developers, or just focused on a quick solution to a simple, yet common problem.

Thanks for the feedback.