大约有 46,000 项符合查询结果（耗时：0.0424秒） [XML]
Is unsigned integer subtraction defined behavior?
...t can be
represented by the resulting type.
(ISO/IEC 9899:1999 (E) §6.2.5/9)
As you can see, (unsigned)0 - (unsigned)1 equals -1 modulo UINT_MAX+1, or in other words, UINT_MAX.
Note that although it does say "A computation involving unsigned operands can never overflow", which might lead ...
How do I copy a hash in Ruby?
...
227
The clone method is Ruby's standard, built-in way to do a shallow-copy:
irb(main):003:0> h...
How to remove an element from a list by index
...
1820
Use del and specify the index of the element you want to delete:
>>> a = [0, 1, 2, 3,...
How do you tell if a string contains another string in POSIX sh?
...tring,
# otherwise returns 1.
contains() {
string="$1"
substring="$2"
if test "${string#*$substring}" != "$string"
then
return 0 # $substring is in $string
else
return 1 # $substring is not in $string
fi
}
contains "abcd" "e" || echo "abcd does not cont...
Is R's apply family more than syntactic sugar?
...ntly different performance:
> fibo <- function(n) {
+ if ( n < 2 ) n
+ else fibo(n-1) + fibo(n-2)
+ }
> system.time(for(i in 0:26) fibo(i))
user system elapsed
7.48 0.00 7.52
> system.time(sapply(0:26, fibo))
user system elapsed
7.50 0.00 7.54
> s...
How can I truncate a double to only two decimal places in Java?
...|
edited May 19 '17 at 17:20
FracturedRetina
70022 gold badges1111 silver badges3636 bronze badges
answe...
Captured variable in a loop in C#
...
205
Yes - take a copy of the variable inside the loop:
while (variable < 5)
{
int copy = v...
Use 'import module' or 'from module import'?
...
|
edited Jan 27 '14 at 22:14
NullUserException
75.1k2424 gold badges194194 silver badges225225 bronze badges
...
John Carmack's Unusual Fast Inverse Square Root (Quake III)
...
answered Aug 28 '09 at 21:52
RushyoRushyo
6,85133 gold badges2929 silver badges4242 bronze badges
...
Should I use multiplication or division?
...
25 Answers
25
Active
...