Java Program to Print the First n Square Numbers

This is the Java Program to Print the First n square Numbers.

Problem Description

Given an integer says n, write a java program to print the first n squared numbers.

Problem Solution

Iterate through the loop from 1 to n and print the square of the loop variable.

Program/Source Code

Here is the source code of the Java Program to Print the First n square Numbers. The program is successfully compiled and tested using IDE IntelliJ Idea in Windows 7. The program output is also shown below.

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//Java Program to Print the First n square Numbers

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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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public class PrintNSquareNumbers {
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    // Function to read n and display the numbers

    public static void main(String[] args) {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

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        int n;
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        System.out.println("Enter the value of n");

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        try{
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            n = Integer.parseInt(br.readLine());

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        }catch (Exception e){
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            System.out.println("An error occurred");

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            return;
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        }
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        if(n<=0){
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            System.out.println("n should be greater than zero");

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            return;
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        }
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        System.out.println("First " + n + " square numbers are ");

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        int i;
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        for(i=1; i<=n; i++){
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            System.out.print(i*i + " ");

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        }
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    }
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}
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Program Explanation

In the function main(), first, an integer say n is entered and then using the loop for(i=1; i<=n; i++) the first n squared numbers are displayed.

Time Complexity: O(n).

Runtime Test Cases

 
Case 1 (Simple Test Case):
 
Enter the value of n
15
First 15 square numbers are 
1 4 9 16 25 36 49 64 81 100 121 144 169 196 225

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