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What's the difference between IQueryable and IEnumerable

...like LINQ-to-SQL to exist because they can parse the expression tree and convert it into equivalent SQL. And because the provider doesn't need to execute until the IQueryable is enumerated (it implements IEnumerable<T>, after all), it can combine multiple query operators (in the above exampl...
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Cast to int vs floor

... Casting to an int will truncate toward zero. floor() will truncate toward negative infinite. This will give you different values if bar were negative. share ...
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Types in MySQL: BigInt(20) vs Int(20)

I was wondering what the difference between BigInt , MediumInt , and Int are... it would seem obvious that they would allow for larger numbers; however, I can make an Int(20) or a BigInt(20) and that would make seem that it is not necessarily about size. ...
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How do I determine the size of my array in C?

... Executive summary: int a[17]; size_t n = sizeof(a)/sizeof(a[0]); Full answer: To determine the size of your array in bytes, you can use the sizeof operator: int a[17]; size_t n = sizeof(a); On my computer, ints are 4 bytes long, so n is...
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PHPMailer character encoding issues

...an use utf8_encode as David says. Otherwise use mb_detect_encoding and mb_convert_encoding on $message. Also take note that $mail -> charSet = "UTF-8"; Should be replaced by: $mail->CharSet = 'UTF-8'; And placed after the instantiation of the class (after the new). The properties are ...
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When to use %r instead of %s in Python? [duplicate]

... The %s specifier converts the object using str(), and %r converts it using repr(). For some objects such as integers, they yield the same result, but repr() is special in that (for types where this is possible) it conventionally returns a re...
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How to view files in binary from bash?

...comfortable with hex just locate the bytes in which you are interested and convert them using a hex calculator. – Duck Nov 19 '09 at 18:38 3 ...
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C语言面试那些事儿──一道指针与数组问题 - C/C++ - 清泛网 - 专注C/C++及内核技术

...面试那些事儿──一道指针与数组问题首先看如下代码:int main(int argc, char** argv){ int a[5] = {1,2,3,4,5}; int* ptr = (int*)(&a + 1); ...首先看如下代码: int main(int argc, char** argv) { int a[5] = {1,2,3,4,5}; int* ptr = (int*)(&a + 1); pr...
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What is the proper declaration of main?

... nor are you allowed to take its address. The return type of main must be int. No other return type is allowed (this rule is in bold because it is very common to see incorrect programs that declare main with a return type of void; this is probably the most frequently violated rule concerning the m...
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How to map with index in Ruby?

What is the easiest way to convert 10 Answers 10 ...