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Chapter 3: Problem 31

Assume that the double variable number holds the value \(459.6329 .\) What format pattern would you use to display the number as \(00459.633 ?\)

Short Answer

Expert verified
Answer: To display the number in the required format, format the number by rounding up to three decimal places and padding with leading zeros to have five digits before the decimal point. In Java, this can be done using the format specifier %09.3f and applying it using the String.format() or System.out.printf() method.

Step by step solution

01

Round the number to 3 decimal places

To achieve a displayed number of 00459.633, the given number must be rounded up to three decimal places. This can be done using a format specifier in the pattern to control the number of decimal places. For example, in Java, we use %.3f to round a number to three decimal places.
02

Pad the number with leading zeros

We want the final number to have 5 digits before the decimal point, so we need to pad the number with leading zeros to make sure that it has 5 digits. In Java, the format specifier for padding with leading zeros is %0Nd, where N is the total number of digits needed, including the leading zeros. In this case, we need a total width of 5 digits, so we use %05d.
03

Combine the format specifiers

We need to combine the format specifiers from step 1 and step 2 to create the overall format pattern that fulfills both requirements. Since we need 5 digits before the decimal point and 3 decimal places after it, we combine the format specifiers as follows: %09.3f This format specifier will pad the number with leading zeros to have a total width of 9 characters (5 digits before the decimal point, 1 decimal point, and 3 digits after it) and round the number to 3 decimal places.
04

Apply the format pattern to the number

Finally, we can apply the format pattern we have determined (%09.3f) to the given number (459.6329) to display it in the desired format as 00459.633. This can be done in programming languages like Java using the String.format() method or System.out.printf() method with the format pattern as an argument.

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