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How to drive C#, C++ or Java compiler to compute 1+2+3+…+1000 at compile time?
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C# example to error at compile time.
class Foo
{
const char Sum = (1000 + 1) * 1000 / 2;
}
Produces the following compilation error:
Constant value '500500' cannot be converted to a 'char'
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Bytes of a string in Java
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A string is a list of characters (i.e. code points). The number of bytes taken to represent the string depends entirely on which encoding you use to turn it into bytes.
That said, you can turn the string into a byte array and then look at its si...
Reading CSV file and storing values into an array
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LINQ way:
var lines = File.ReadAllLines("test.txt").Select(a => a.Split(';'));
var csv = from line in lines
select (from piece in line
select piece);
^^Wrong - Edit by Nick
It appears the original answerer was attempting to populate csv with a...
NASM x86汇编入门指南 - C/C++ - 清泛网 - 专注C/C++及内核技术
... message: db ‘Hello world!’ ;相当于char/unsigned char* Hello world!
msglength: equ 12 ; 字符串长度12字节
buffersize: dw 1024 ;缓冲区大小1024个字长(相当于short类型)
.bss sect...
Convert a character digit to the corresponding integer in C
Is there a way to convert a character to an integer in C?
15 Answers
15
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Multiple INSERT statements vs. single INSERT with multiple VALUES
...t
One place where this information is leveraged is shown by @Lieven here
SELECT *
FROM (VALUES ('Lieven1', 1),
('Lieven2', 2),
('Lieven3', 3))Test (name, ID)
ORDER BY name, 1/ (ID - ID)
Because at compile time it can determine that the Name column has no duplicates it...
What is the “assert” function?
... not raise an exception, it has parentheses around its argument, and the # character does not introduce a comment.
– Steve Jessop
Oct 15 '09 at 11:36
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Repeat Character N Times
In Perl I can repeat a character multiple times using the syntax:
23 Answers
23
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内存调试技巧：C 语言最大难点揭秘 - C/C++ - 清泛网 - 专注C/C++及内核技术
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清单 1. 简单的潜在堆内存丢失和缓冲区覆盖
void f1(char *explanation)
{
char p1;
p1 = malloc(100);
(void) sprintf(p1,
"The f1 error occurred because of '%s'.",
explanation);
loca...
How do I get a consistent byte representation of strings in C# without manually specifying an encodi
...e[] GetBytes(string str)
{
byte[] bytes = new byte[str.Length * sizeof(char)];
System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
return bytes;
}
// Do NOT use on arbitrary bytes; only use on GetBytes's output on the SAME system
static string GetString(byte[] bytes)
...