Today is the 824th day of learning programming with a slightly cold rain!
Hello, everyone! This is the CSP 2024 Group J Preliminary Exam Questions.
Day 824
CSP 2024 Group J Preliminary Exam Questions
Read the Program
2. Read the Program (The program input does not exceed the defined range of arrays or strings; for true/false questions, fill in √ for correct and ⨉ for incorrect; unless otherwise specified, true/false questions are worth 1.5 points, multiple-choice questions are worth 3 points, totaling 40 points)
Question 3
True/False Questions
1. When the input is 2 3, the return value of customFunction(2, 3) is 64. ( )
2. (This question is incorrect; please select both [Correct] and [Incorrect] to receive corresponding points) When b is a negative number, customFunction(a, b) will enter infinite recursion. ( )
3. (This question is incorrect; please select both [Correct] and [Incorrect] to receive corresponding points) As the value of b increases, the program’s runtime becomes longer. ( )
Multiple Choice Questions
1. When the input is 5 4, the return value of customFunction(5, 4) is ( ).
A. 5
B. 25
C. 250
D. 625
2. If the input is x=3 and y=3, the final output of the program is ( ).
A. 27
B. 81
C. 144
D. 256
3. If the customFunction function is changed to return a + customFunction(a-1, b-1); and the input is 3, the final output of the program is ( ).
A. 9
B. 16
C. 25
D. 36
Answers:
START OF SPRING
Solution: This question tests the use of functions in C++.
True/False Questions
1. X
Explanation: The function customFunction is supposed to return b+1 instances of a, so the return value should be 8, not 64, hence it is incorrect.
2. V
Explanation: If b is negative, this question should lead to infinite recursion, but it will eventually cause a stack overflow, so it does not actually result in infinite recursion.
3. V
Explanation: As the value of b increases, the number of iterations increases. Therefore, the program’s runtime becomes longer. However, there may also be cases of integer overflow.
Multiple Choice Questions
1. B
Explanation: The result of adding b instances of a is 25, so choose B.
2. C
Explanation: The result of adding b instances of a is 4 instances of 3, resulting in 12, and the final result includes a pow function, leading to 144.
3. D
Explanation: After the change, the code logic becomes 3+2+1+0 squared, which is 36. Choose D.
20
25
8
AUGUST
Day
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
1
Army Day
2
9th
3
10th
4
11th
5
12th
6
13th
7
Beginning of Autumn
8
National Fitness Day
9
Last Fub
10
17th
11
18th
12
19th
13
20th
14
21st
15
22nd
16
23rd
17
24th
18
25th
19
Doctor’s Day
20
27th
21
28th
22
29th
23
End of Heat
24
2nd
25
3rd
26
4th
27
5th
28
6th
29
Qixi Festival
30
8th
31
9th
@秀米XIUMI
With a slightly cold rain
Open Wisdom Station
