Integer puzzles Check if the statements are always true? 1. x < 0 => ((x*2) < 0) 2. ux >= 0 3. x & 7 == 7 4 ux > -1 Initialization int x = foo (); int y = bar(); => (x<<30) < 0

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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III.
Integer puzzles
Check if the statements are always true?
1. x < 0
2. ux >= 0
3. x & 7 == 7
4. ux>-1
5. x > y
6. xx >= 0
Initialization
int x = foo();
int y = bar();
unsigned ux = x;
unsigned uy = y;
=> ((x+2) < 0)
=>
(x<<30) < 0
=> -x < -Y
7. x > 0 && y > 0 =>
8. x > 0
=>
9. x < 0
=>
10. (x-x) >>31 == -1
11.ux >> 3 == ux/8
12.x >> 3 == x/8
13.x & (x-1) != 0
x + y > 0
-X <= 0
-X >= 0
Transcribed Image Text:III. Integer puzzles Check if the statements are always true? 1. x < 0 2. ux >= 0 3. x & 7 == 7 4. ux>-1 5. x > y 6. xx >= 0 Initialization int x = foo(); int y = bar(); unsigned ux = x; unsigned uy = y; => ((x+2) < 0) => (x<<30) < 0 => -x < -Y 7. x > 0 && y > 0 => 8. x > 0 => 9. x < 0 => 10. (x-x) >>31 == -1 11.ux >> 3 == ux/8 12.x >> 3 == x/8 13.x & (x-1) != 0 x + y > 0 -X <= 0 -X >= 0
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The int and unsigned int have a size of 4 bytes. The value of the integer ranges from -2,147,483,648 to 2,147,483,647. The value of an unsigned integer ranges from 0 to 4,294,967,295.

The & operator is used to perform bitwise AND between two values. The AND operator returns 1 if both the operand bits are 1. 

The << operator is used to perform the left shift of the bits in a value.

The == operator checks the equality of two values and returns true if they are equal.

 

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