Today is the 852nd day of learning programming with a slightly cold rain!
Hello, everyone! This is the problem from the CSP-J2025 Preliminary Round.
Day 852
CSP2025-J Preliminary Round
2. In C++, what is the output of the following code: int x=255; cout<<(x&(x-1));?
Answer: B
START OF SPRING
The explanation: First, from the conclusion perspective, the operation x&(x-1) clears the rightmost 1 in the binary representation of x. Therefore, the result is 254.
20
25
9
SEPTEMBER
Day
Mon
Tue
Wed
Thu
Fri
Sat
1
10
2
11
3
Victory Day of the War of Resistance
4
13
5
14
6
Ghost Festival
7
White Dew
8
17
9
18
10
Teachers’ Day
11
20
12
21
13
22
14
23
15
24
16
25
17
26
18
September 18 Incident
19
28
20
29
21
30
22
August
23
Autumn Equinox
Harvest Festival
24
3
25
4
26
5
27
6
28Class
7
29
8
30
Martyrs’ Memorial Day
@秀米XIUMI
With a slightly cold rain
Open Wisdom Station
