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Java Exercises: Print an American flag on the screen

Java Basic: Exercise-14 with Solution

Write a Java program to print an American flag on the screen.

Pictorial Presentation:

Java: Print an American flag on the screen

Sample Solution:

Java Code:

public class Exercise14 {
 
   public static void main(String[] args)
    {
        System.out.println("* * * * * * ==================================");
        System.out.println(" * * * * *  ==================================");
        System.out.println("* * * * * * ==================================");
        System.out.println(" * * * * *  ==================================");
        System.out.println("* * * * * * ==================================");
        System.out.println(" * * * * *  ==================================");
        System.out.println("* * * * * * ==================================");
        System.out.println(" * * * * *  ==================================");
        System.out.println("* * * * * * ==================================");
        System.out.println("==============================================");
        System.out.println("==============================================");
        System.out.println("==============================================");
        System.out.println("==============================================");
        System.out.println("==============================================");
        System.out.println("==============================================");
    }
}

Sample Output:

* * * * * * ==================================                                                                
 * * * * *  ==================================                                                                
* * * * * * ==================================                                                                
 * * * * *  ==================================                                                                
* * * * * * ==================================                                                                
 * * * * *  ==================================                                                                
* * * * * * ==================================                                                                
 * * * * *  ==================================                                                                
* * * * * * ==================================                                                                
==============================================                                                                
==============================================                                                                
==============================================                                                                
==============================================                                                                
==============================================                                                                
==============================================

Flowchart:

Flowchart: Java exercises: Print an American flag on the screen

Sample Solution:

Java Code:

public class Main {
 public static void main(String[] args) {
  String p1 = "* * * * * * ==================================\n * * * * *  ==================================";
  String p2 = "==============================================";
  for (int i = 0; i < 4; i++) {
   System.out.println(p1);
  }
  System.out.println("* * * * * * ==================================");
  for (int i = 0; i < 6; i++) {
   System.out.println(p2);
  }
 }
}

Output:

* * * * * * ==================================
 * * * * *  ==================================
* * * * * * ==================================
 * * * * *  ==================================
* * * * * * ==================================
 * * * * *  ==================================
* * * * * * ==================================
 * * * * *  ==================================
* * * * * * ==================================
==============================================
==============================================
==============================================
==============================================
==============================================
==============================================

Flowchart:

Flowchart: Java exercises: Print an American flag on the screen.

Java Code Editor:

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Java: Tips of the Day

Java: How to round a number to n decimal places in Java

Use setRoundingMode, set the RoundingMode explicitly to handle your issue with the half-even round, then use the format pattern for your required output.

DecimalFormat df = new DecimalFormat("#.####");
df.setRoundingMode(RoundingMode.CEILING);
for (Number n : Arrays.asList(12, 123.12345, 0.23, 0.1, 2341234.212431324)) {
    Double d = n.doubleValue();
    System.out.println(df.format(d));
}

Output:

12
123.1235
0.23
0.1
2341234.2125

For example, when you know that your values are accurate up to 6 digits, then to round half-way values up, add that accuracy to the value:

Double d = n.doubleValue() + 1e-6;

To round down, subtract the accuracy.

Ref: https://bit.ly/3a4mvz0