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c++提取复数的实部和虚部 - C/C++ - 清泛网 - 专注C/C++及内核技术
...// 实部
REAL i; // 虚部
};
bool Parse(COMPLEX * cp, const char * strCplx, const int len)
{
memset(cp, 0, sizeof(COMPLEX));
char buf[MAX_BUF_LEN];
int signPos = -1, // +/-号位置
iPos = -1; // 结尾的i的位置
for (int i = len-1; i >-1;...
Fastest way to remove first char in a String
...he string, whereas TrimStart does a scan from the left with a test on each character and then has to perform exactly the same work as the other two methods. Seriously, though, this is splitting hairs.
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LINQ: “contains” and a Lambda query
...led buildingStatus . I'd like to check whether it contains a status whose char code (returned by GetCharCode() ) equals some variable, v.Status .
...
Importance of varchar length in MySQL table
...tain of the length of strings and do not want them cut off, I make them varchar(200) which is generally much bigger than I need. Is there a big performance hit in giving a varchar field much more length than necessary?
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What is the string length of a GUID?
I want to create a varchar column in SQL that should contain N'guid' while guid is a generated GUID by .NET ( Guid.NewGuid ) - class System.Guid.
...
Equals(=) vs. LIKE
... operator compares whole strings.
LIKE is a string operator that compares character by character.
To complicate matters, both operators use a collation which can have important effects on the result of the comparison.
Motivating Example
Let's first identify an example where these operators produ...
Assign one struct to another in C
...ment is supported for structs. However, there are problems:
struct S {
char * p;
};
struct S s1, s2;
s1.p = malloc(100);
s2 = s1;
Now the pointers of both structs point to the same block of memory - the compiler does not copy the pointed to data. It is now difficult to know which struct insta...
C++11 tuple 这一篇就够了 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
#include <iostream>
#include <tuple>
int main ()
{
int myint;
char mychar;
float myfloat;
std::tuple<int,float,char> mytuple;
mytuple = std::make_tuple (10, 2.6, 'a'); // packing values into tuple
//std::tie (myint, std::ignore, mychar) = mytuple; // unpacking...
Clojure: reduce vs. apply
...more vague and thus can only be optimized on a case-by-case basis. str and concat are the two prevalent exceptons.
– cgrand
Aug 22 '13 at 9:41
1
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Android Reading from an Input stream efficiently
... avoid creating new String objects on each append and to avoid copying the char arrays. The implementation for your case would be something like this:
BufferedReader r = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder total = new StringBuilder();
for (String line; (line = r.re...