Pearson eText for Starting out with Visual C# -- Instant Access (Pearson+)
5th Edition
ISBN: 9780137502783
Author: Tony Gaddis
Publisher: PEARSON+
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Chapter 14, Problem 2AW
Program Plan Intro
LINQ (Language Integrated Query):
A query language that is built into C# and that can be used to query data from many sources is termed as LINQ.
- The queries have been used to select the records in the table.
- The query statements will select and retrieve the records from the table and store it into a variable.
Syntax to select records from the table:
var variableName = From elementName In dataset.table
Select elementName
- In the above syntax,
- The var statement is used to declare a variable which can be used to store the selected records.
- The keyword From is used to create an element and that element refers to the data set of the table.
- The keyword Select is used to select all records from the table.
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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 14 Solutions
Pearson eText for Starting out with Visual C# -- Instant Access (Pearson+)
Ch. 14.1 - Prob. 14.1CPCh. 14.1 - Prob. 14.2CPCh. 14.1 - Prob. 14.3CPCh. 14.1 - Prob. 14.4CPCh. 14.1 - Prob. 14.5CPCh. 14.2 - Prob. 14.6CPCh. 14.3 - Prob. 14.7CPCh. 14.3 - Prob. 14.8CPCh. 14.3 - Prob. 14.9CPCh. 14.3 - Prob. 14.10CP
Ch. 14.3 - Prob. 14.11CPCh. 14.3 - Prob. 14.12CPCh. 14.4 - Prob. 14.13CPCh. 14.4 - Prob. 14.14CPCh. 14.4 - Prob. 14.15CPCh. 14.4 - Prob. 14.16CPCh. 14.4 - Prob. 14.17CPCh. 14 - Prob. 1MCCh. 14 - Prob. 2MCCh. 14 - Prob. 3MCCh. 14 - Prob. 4MCCh. 14 - Prob. 5MCCh. 14 - Prob. 6MCCh. 14 - Prob. 7MCCh. 14 - Prob. 8MCCh. 14 - Prob. 9MCCh. 14 - Prob. 10MCCh. 14 - Prob. 1TFCh. 14 - Prob. 2TFCh. 14 - Prob. 3TFCh. 14 - Prob. 4TFCh. 14 - Prob. 5TFCh. 14 - Prob. 6TFCh. 14 - Prob. 7TFCh. 14 - Prob. 8TFCh. 14 - Prob. 1SACh. 14 - Prob. 2SACh. 14 - Prob. 3SACh. 14 - Prob. 4SACh. 14 - Prob. 5SACh. 14 - Prob. 1AWCh. 14 - Prob. 2AWCh. 14 - Prob. 3AWCh. 14 - Prob. 4AWCh. 14 - Prob. 5AWCh. 14 - Prob. 6AWCh. 14 - Prob. 7AWCh. 14 - Prob. 8AWCh. 14 - Prob. 5PP
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