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Simple calculations for working with lat/lon and km distance?
...ate conversions are:
Latitude: 1 deg = 110.574 km
Longitude: 1 deg = 111.320*cos(latitude) km
This doesn't fully correct for the Earth's polar flattening - for that you'd probably want a more complicated formula using the WGS84 reference ellipsoid (the model used for GPS). But the error is prob...
Forms authentication timeout vs sessionState timeout
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answered Jul 23 '13 at 14:32
IcarusIcarus
58.7k1212 gold badges8585 silver badges109109 bronze badges
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Unicode, UTF, ASCII, ANSI format differences
What is the difference between the Unicode , UTF8 , UTF7 , UTF16 , UTF32 , ASCII , and ANSI encodings?
2 Answers
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C++ 通过主机名/域名获取IP - C/C++ - 清泛网 - 专注C/C++及内核技术
....h> 该头文件定义了Socket编程的功能 #pragma comment(lib,"ws2_32.lib") 连接ws2_32.lib库...代码如下：
#include <winsock2.h> //该头文件定义了Socket编程的功能
#pragma comment(lib,"ws2_32.lib") //连接ws2_32.lib库.只要程序中用到Winsock API 函数，...
How to get the raw value an field?
... a string.
– Bergi
Sep 17 '13 at 15:32
Opera supports the .validity property, but doesn't correctly handle .valid?!
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Javascript Split string on UpperCase Characters
...) after 3.
– Diablo
Jul 19 '19 at 9:32
add a comment
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Efficient way to determine number of digits in an integer
...++;
}
return digits;
}
// partial specialization optimization for 32-bit numbers
template<>
int numDigits(int32_t x)
{
if (x == MIN_INT) return 10 + 1;
if (x < 0) return numDigits(-x) + 1;
if (x >= 10000) {
if (x >= 10000000) {
if (x >= 100...
How to append text to a text file in C++?
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edited Jun 25 '18 at 10:32
Georgy
4,77555 gold badges3838 silver badges4646 bronze badges
answered May...
Is there a constraint that restricts my generic method to numeric types?
...orted type.
– Ergwun
Jul 5 '11 at 7:32
15
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Why isn't sizeof for a struct equal to the sum of sizeof of each member?
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Here's an example using typical settings for an x86 processor (all used 32 and 64 bit modes):
struct X
{
short s; /* 2 bytes */
/* 2 padding bytes */
int i; /* 4 bytes */
char c; /* 1 byte */
/* 3 padding bytes */
};
struct Y
{
int i; /* 4 bytes */...