EBK STARTING OUT WITH PROGRAMMING LOGIC
5th Edition
ISBN: 8220106960493
Author: GADDIS
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 1TF
The process of input validation works like this: When the user of a
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2. Signed Integers
Unsigned binary numbers work for natural numbers, but many calculations use negative
numbers as well. To deal with this, a number of different methods have been used to represent
signed numbers, but we will focus on two's complement, as it is the standard solution for
representing signed integers.
2.1 Two's complement
• Most significant bit has a negative value, all others are positive. So, the value of an n-digit
-2
two's complement number can be written as: Σ2 2¹ di 2n-1 dn
• Otherwise exactly the same as unsigned integers.
i=0
-
• A neat trick for flipping the sign of a two's complement number: flip all the bits (0 becomes 1,
or 1 becomes 0) and then add 1 to the least significant bit.
• Addition is exactly the same as with an unsigned number.
2.2 Exercises
For questions 1-3, answer each one for the case of a two's complement number and an
unsigned number, indicating if it cannot be answered with a specific representation.
1. (15 pts) What is the largest integer…
can u solve this question
1. Unsigned Integers
If we have an n-digit unsigned numeral dn-1d n-2...do in radix (or base) r, then the value of that
numeral is
n−1
r² di
Σi=0
which is basically saying that instead of a 10's or 100's place we have an r's or
r²'s place. For binary, decimal, and hex r equals 2, 10, and 16, respectively.
Just a reminder that in order to write down a large number, we typically use the IEC or SI
prefixing system:
IEC: Ki = 210, Mi = 220, Gi = 230, Ti = 240, Pi = 250, Ei = 260, Zi = 270, Yi = 280;
SI: K=103, M = 106, G = 109, T = 10¹², P = 1015, E = 10¹8, Z = 1021, Y = 1024.
1.1 Conversions
a. (15 pts) Write the following using IEC prefixes: 213, 223, 251, 272, 226, 244
21323 Ki8 Ki
223 23 Mi 8 Mi
b. (15 pts) Write the following using SI prefixes: 107, 10¹7, 10¹¹, 1022, 1026, 1015
107 10¹ M = 10 M
=
1017102 P = 100 P
c. (10 pts) Write the following with powers of 10: 7 K, 100 E, 21 G
7 K = 7*10³
Chapter 7 Solutions
EBK STARTING OUT WITH PROGRAMMING LOGIC
Ch. 7.1 - What does the phrase garbage in, garbage out mean?Ch. 7.1 - Give a general description of the input validation...Ch. 7.2 - Describe the steps that are generally taken when...Ch. 7.2 - Prob. 7.4CPCh. 7.2 - If the input that is read by the priming read is...Ch. 7 - GIGO stands for a. great input, great output b....Ch. 7 - The integrity of a programs output is only as good...Ch. 7 - The input operation that appears just before a...Ch. 7 - Validation loops are also known as a. error traps...Ch. 7 - The term empty input describes what happens when...
Ch. 7 - The process of input validation works like this:...Ch. 7 - The priming read appears inside the validation...Ch. 7 - The approach of using a posttest validation loop...Ch. 7 - What does the phrase garbage in, garbage out mean?Ch. 7 - Give a general description of the input validation...Ch. 7 - Prob. 3SACh. 7 - In this chapter you saw how a posttest loop can be...Ch. 7 - Design an algorithm that prompts the user to enter...Ch. 7 - Design an algorithm that prompts the user to enter...Ch. 7 - Design an algorithm that prompts the user to enter...Ch. 7 - Design an algorithm that prompts the user to enter...Ch. 7 - Design an algorithm that prompts the user to enter...Ch. 7 - Prob. 1DECh. 7 - Why does the following pseudocode not perform as...Ch. 7 - The following pseudocode works, but it performs a...Ch. 7 - Payroll Program with Input Validation Design a...Ch. 7 - Theater Seating Revenue with Input Validation A...Ch. 7 - Fat Gram Calculator Design a program that asks for...Ch. 7 - Speeding Violation Calculator Design a program...Ch. 7 - Rock, Paper, Scissors Modification Programming...
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