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还原MongoDB中Decimal类型数据 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...换为Double类型存储。
但是，取出来的数据（原数据为0.12345）可能是类似0.1234499999999的形式，ToString("f4")转化string值为0.1234，正确值应为0.1235。
解决方法：
先还原Double类型后值为0.12345，再做四舍五入。
private static string Deci...
蓝牙配对pin码设置 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...改过设备的 PIN 码，那么默认的 PIN 码很可能是 0000 或者 1234。自定义 PIN 码：为了更好地保护您的蓝牙设备，建议您将默认的 PIN 码更改为自定义的 PIN 码。您可以在蓝牙设备的设置中找到 PIN 码选项，然后输入您想要使用的数字...
Javascript object Vs JSON
...key that was just an exclamation point, you would need quotes:
a = { "!": 1234 } // Valid
a = { !: 1234 } // Syntax error
In most cases though, you can omit the quotes around keys on object literals.
Q2: JSON is literally a string representation. It is just a string. So, consider this:
var tes...
Java string to date conversion
... fraction 978
A milli-of-day number 1234
n nano-of-second number 987654321
N nano-of-day number 1234000000
V time-zone ID zone-id America/Los_Angeles; Z; -08:30
z time-zone...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...ruct s1 x;
struct s2 y;
};
int main()
{
union su s;
s.x.a = 0x1234;
s.x.b = 0x56789abc;
printf("sizeof s1 = %zu, sizeof s2 = %zu\n", sizeof(struct s1), sizeof(struct s2));
printf("s.y.a=%hx, s.y.b=%x\n", s.y.a, s.y.b);
return 0;
}
Output:
sizeof s1 = 6, sizeof s2 = 8...
Skip the headers when editing a csv file using Python
...amed indexing.
Given "foo.csv" as follows:
FirstColumn,SecondColumn
asdf,1234
qwer,5678
Use DictReader like this:
import csv
with open('foo.csv') as f:
reader = csv.DictReader(f, delimiter=',')
for row in reader:
print(row['FirstColumn']) # Access by column header instead of co...
Python's most efficient way to choose longest string in list?
...thon documentation itself, you can use max:
>>> mylist = ['123','123456','1234']
>>> print max(mylist, key=len)
123456
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follo...
java : convert float to String and String to float
...
String str = "1234.56";
float num = 0.0f;
int digits = str.length()- str.indexOf('.') - 1;
float factor = 1f;
for(int i=0;i<digits;i++) factor /= 10;
for(int i=str.length()-1;i>=0;i--){
if(str.charAt(i) == '.'){
fact...
Strip all non-numeric characters from string in JavaScript
...
If you need this to leave the dot for float numbers, use this
var s = "-12345.50 €".replace(/[^\d.-]/g, ''); // gives "-12345.50"
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follow
...
C# Passing Function as Argument [duplicate]
...
}
public void Client()
{
double result = Diff(1.234, x => x * 456.1234);
double secondResult = Diff(2.345, MyFunctionMethod);
}
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