Homework Assignment #1 Solution

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Description

Instructions: Please submit on Canvas.

 

Problem 1 [6pts]. Determine the answer to the following expressions. You must provide a short explanation (a sentence of two) for each one.

 

  • 2 % 3

 

  • 0 % 3

 

  • 3 % 3

 

  • -2%3

 

  • 2%-3

 

  • -2%-3

 

Submission format: A text file problem1.txt.

 

Problem 2 [5pts]. We all know about bits and bytes. In particular we know that 1 byte equals 23 = 8 bits. Now, you might have noticed that a hard disk drive which is advertised as having a capacity equal to 500 Gigabytes, shows up in your operating system with a smaller number, approximately 465. Why is that? It is because, in marketing, the SI1 units are used where 1Kilo = 103 = 1000. On the other hand, in computer science we use the IEC2 standard where 1Kilo = 210 = 1024. To avoid confusion, when working with powers of 2, we are supposed to write KiB instead of KB (i.e. kibi instead of kilo) and so on.3 For example

 

1MB = 1000KB = 1000 1000B = 106B

 

1MiB = 1024KiB = 1024 1024B = 220B

 

In this problem, you write a simple program that coverts giga to gibi. For example, given 500GB as input you must calculate its equivalence in GiB. Below is a skeleton for the code

1Systèm Internationale

 

2International Electrotechnical Commission

 

3Read https://en.wikipedia.org/wiki/biary_prefix

 

1

 

public class Converter {

 

public static void main(String[] args) { long giga = 500;

 

long gibi = 0;

 

  • your code for computing gibi from giga System.out.println(giga + “GB = ” + gibi + “GiB”);

 

}

 

}

 

Submission format: A java source file Converter.java.

 

Problem 3 [4pts]. The following program will compile and run, but it uses a poor pro-gramming style. Modify the code so that it uses the coding conventions described in the class and mentioned in the book.

 

public class mess {

 

public static void main(String[] args)

 

{

 

double TIME; double PACE;

 

System.out.println(“This program calculates pace”);

 

TIME = 35.5; /* 35 minutes and 30 seconds */

 

PACE = TIME / distance;

 

System.out.println(“Pace is ” + PACE + ” miles per hour.”); double distance = 6.21;

 

}

 

}

 

Refer to §1.4 (Program Style) in your book or consult the slides. Submission format: A Java source file with the correct name and extension.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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