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Chapter 3: Problem 33

Assume that the double variable number holds the value \(7634869.1 .\) What format pattern would you use to display the number as \(7,634,869.10 ?\)

Short Answer

Expert verified
Answer: The format pattern is "#,##0.00".

Step by step solution

01

Identify the formatting method

We will use DecimalFormat in the Java programming language to format the number. DecimalFormat allows us to format numbers according to a specific pattern.
02

Import the necessary libraries

To use the DecimalFormat class, we need to import the java.text.DecimalFormat library. This must be placed at the top of the Java source code file. ```java import java.text.DecimalFormat; ```
03

Create a DecimalFormat object with format pattern

Create a DecimalFormat object and set the format pattern. To format the number as comma separated with two decimal places, the pattern should be "#,##0.00". This pattern defines the following: - commas as the thousand separator - at least one digit before the decimal point - exactly two digits after the decimal point ```java DecimalFormat decimalFormat = new DecimalFormat("#,##0.00"); ```
04

Format the double value using decimalFormat object

After creating the DecimalFormat object and setting the pattern, format the double value using the format() method of the decimalFormat object. ```java double number = 7634869.1; String formattedNumber = decimalFormat.format(number); ```
05

Display the formatted number

Finally, display the formatted number using a print statement. ```java System.out.println("Formatted Number: " + formattedNumber); ``` The output will be: ``` Formatted Number: 7,634,869.10 ```

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Most popular questions from this chapter

Write an if statement that displays the message "The number is valid" if the variable speed is within the range 0 through 200.

Write an if-else statement that assigns 1 to \(x\) when \(y\) is equal to \(100 .\) Otherwise it should assign 0 to \(x\).

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Write code that tests the variable \(x\) to determine whether it is greater than \(0 .\) If \(x\) is greater than \(0,\) the code should test the variable \(y\) to determine whether it is less than \(20 .\) If \(y\) is less than \(20,\) the code should assign 1 to the variable \(z\). If \(y\) is not less than \(20,\) the code should assign 0 to the variable \(z\).
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