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How to make a square star pattern in Java

Ayush Trivedi

In this shot, we will learn how to create a square star pattern using JavaScript. This pattern is the simplest among the other patterns. The logic to create a square pattern is easy to understand and implement.

A square star pattern looks like the image below:.

This is a 5 x 5 square star pattern. You can see that we need to print * at every row and column. The logic for this is simple, you need a nested for loop which will loop for 5(n) times, along with the outer loop. At every i,j combination you have to print *.

Code

let n = 5; // row or column count

for(let i = 0; i < n; i++) { // external loop
  for(let j = 0; j < n; j++) { // internal loop
    process.stdout.write('*');
  }
  // newline after each row
  console.log();
}

Explanation

  • In line 1, we initialize the number of rows (the side) in the square.

  • In line 3, the first for loop will iterate rows. We have five rows (n = 5) so it will loop five times.

  • In line 4, this nested for loop will print * n times which is 5, because n = 5, this loop is responsible for printing the columns.

  • In line 5, we print the * using standard method process.stdout.write('*').

  • In line 8, after every row is completed we need to change the line. To get to the next line we use console.log() with a null value, which will print nothing and change to the next line.

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