Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)
7th Edition
ISBN: 9780134802213
Author: Tony Gaddis
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 1MC
What will the println statement in the following
int x = 5;
System.out.println(x++);
- a. 5
- b. 6
- c. 0
- d. None of these
Expert Solution & Answer
Program Description Answer
The println statement in the given program segment displays the value “5”.
Hence, the correct answer is option “A”.
Explanation of Solution
Increment operator “++”:
The increment operator is used to increment or increase the value of the variable by “1”.
Example:
/*the variable val is increased by 1 with a postfix representation */
val++;
/*the variable val is increased by 1 with a prefix representation */
++val;
In the given program segment, the variable “x” is declared and initialized with the value “5”. In the println statement, post-increment operation is performed using the statement “x++”. As per postfix mode, the value of the variable “x” is printed and then the value is incremented. Therefore, the value of “x”, which is “5” is printed using the println statement and then the value of “x” is incremented.
Explanation for incorrect options:
b. 6:
The value of “x” is incremented to 6 after it is displayed.
Hence, the option “B” is wrong.
c. 0:
The value of “x” is initialized as 5, and then it is not modified as “0”.
Hence, the option “C” is wrong.
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2. Test Scores
File: test_scores.py
Write pseudocode for the main() part of a program that asks the user to enter 4 test scores between 0 and 100, then displays a JCU grade for each score and also the average test score.
When you have written the pseudocode for main, implement your solution in Python code and test it with a range of meaningful data.
Remember that we've done the JCU grades question before, so copy your function from that practical code file.
Sample Output
Score: 3
Score: 50.5
Score: 66
Score: 100
Score 3.0, which is N
Score 50.5, which is P
Score 66.0, which is C
Score 100.0, which is HD
The average score was 54.875
Enhancements
When you have that working...
We asked for 4 scores. Have a look at your code... did you use 4 as a numeric literal or a constant?Change 4 to 3... Did you have to change the program in more than one place?If so, then you've missed one of the things we've taught...As a strong guideline: if you need to use the same literal more than once, you…
Chapter 4 Solutions
Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)
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