Answered: Using Java; Lets say I have a double…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Using Java; Lets say I have a double named 'number'. In 3 trials, I'll set 'number' to these 3 values. 3.12882 ; 5.38293 ; and 9.3829. I create a new variable called double shortnumber. I want this variable to truncate those 3 values, to 3 decimals. How would I approach this using basic arithmetic and casting? Ex. 3.12882 to 3.128 without it rounding to 3.129.

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Does the math function evaluate differently from just basic arthmetic considering these 2 would be equal? And would there be a way to gain the same results without using math.pow?

public class Trial {
public static void main(String[] args) {
// Original values
double number1= 31.06882;
double number2 = 31.06882;
double number3 = 9.3829;
// Number of decimal places to truncate to
int decimalPlaces =
2;
// Truncate number1 to 3 decimal places
double shortNumber1 = (int) (number1¹ * Math.pow(10, decimalPlaces)) / Math.pow(10, decimalPlaces);
// Truncate number2 to 3 decimal places
double shortNumber2 = (int) (number2 * 100) / 100;

Shortened number1: 31.06
Shortened number2: 31.0

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