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CS 1150 – Lab #3 – Representing Numbers. TA – Sanjaya Wijeratne E-mail – wijeratne.2@wright.edu Web Page - http://knoesis.org/researchers/sanjaya/. TA Labs, Office Hours Laboratory Polices. Lab Hours 2:30 PM - 4:20 PM, Monday and Friday at Room 320 - Oelman Hall TA Office Hours

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## CS 1150 – Lab #3 – Representing Numbers

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**CS 1150 – Lab #3 – Representing Numbers**TA – Sanjaya Wijeratne E-mail – wijeratne.2@wright.edu Web Page - http://knoesis.org/researchers/sanjaya/**TA Labs, Office Hours Laboratory Polices**• Lab Hours • 2:30 PM - 4:20 PM, Monday and Friday at Room 320 - OelmanHall • TA Office Hours • 4:40 PM - 5:40 PM, Monday and Friday at Room 316 - Russ Engineer Center • By appointment – Please email to wijeratne.2@wright.edu • Refer to CS 1150 Course Syllabus for Class and Laboratory Policies • Zero tolerance policy for Academic Misconduct – All parties will get 0% marks CS 1150 - Lab 2 - Exploring Number Systems**Lab # 3 Overview**• Learn How Negative Numbers are Represented in Computers • Sign-Magnitude and Two’s Complement Representations • Learn How Colors and Text are Represented in Computers • Complete Section 3A – Ex 1, Section 3B – Ex 1 and Ex 3 • Extra Credit- Section 3A – Ex 2, Section 3B – Ex 2, Section 3C – Ex 1 • Lab #3 Due Date - Sep 22, 2013 11:55 PM CS 1150 - Lab 2 - Exploring Number Systems**How to Submit Lab # 3**• Hard copy (Preferred) • When you complete, hand it over to me • Pilot • Go to Pilot Course Page and Use Dropbox Submission Link to upload your files • My Mailbox at CS Department • Go to CS Department Front Desk and ask them to put your assignment into my mailbox – Please write my name in your assignment (TA – CS 1150 – Sanjaya Wijeratne) CS 1150 - Lab 2 - Exploring Number Systems**Sign-Magnitude Representation**• Sign-Magnitude Representation • Sign – Ordering of the number (Positive or Negative) • Value – Magnitude Source – CS 1150 Slides for Data Representation by Karen Mayer CS 1150 - Lab 2 - Exploring Number Systems**Two’s Complement**• MSB Represents the Sign • Negative – MSB is 1 • Convert numbers to Two’s Complement • Invert the bits and add 1 Source – CS 1150 Slides for Data Representation by Karen Mayer CS 1150 - Lab 2 - Exploring Number Systems**Lab #3 – Section 3A**• Run Negative Binary Numbers Applet CS 1150 - Lab 2 - Exploring Number Systems**Lab #3 – Section 3A Ex 1 Question 9**CS 1150 - Lab 2 - Exploring Number Systems**Representing Text**• ASCII Character Set • 7 bits to represent a character + 1 check bit • First 32 ASCII characters are special purposes – Eg Tab, Return • Unicode Character Set • 16 bits to represent a character • Can represent every character in every language in the world • 8 Bits = 1 Byte CS 1150 - Lab 2 - Exploring Number Systems**Lab #3 – Section 3B Ex 1 Question 6**• Think about the relationship you found between upper case letters and lower case letters in question 5 • Think you have to write an applet • What is the input? • What is the output? • Now answer the question 6 CS 1150 - Lab 2 - Exploring Number Systems**Extra Credit – Section 3A – Ex 2**CS 1150 - Lab 2 - Exploring Number Systems**Extra Credit–Section 3A Ex 2 Question 7**• Try to find a relationship among numbers in the table • Eg – Whether one number is a multiplication of another • Use the relationship you see to answer part III • Please write the answer and relationship you identify both for part III CS 1150 - Lab 2 - Exploring Number Systems**Additional Help**• Chapter 3 Slides by Ms. Karen Meyer discussed in Class • Chapter 3 of Course Text Book – Data Representation CS 1150 - Lab 2 - Exploring Number Systems**Questions ?**If you have questions, please raise your hand, Colin or myself will come to help you CS 1150 - Lab 2 - Exploring Number Systems

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