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- How to keep one variable constant with other one changing with row in . . .
207 Lets say I have one cell A1, which I want to keep constant in a calculation For example, I want to calculate a value like this: =(B1+4) (A1) How do I make it so that if I drag that cell to make a calculation across cells in many rows, only the B1 value changes, while A1 always references that cell, instead of going to A2, A3, etc ?
- Java switch statement: Constant expression required, but it IS constant
1 - The constant expression restrictions can be summarized as follows Constant expressions a) can use primitive types and String only, b) allow primaries that are literals (apart from null) and constant variables only, c) allow constant expressions possibly parenthesised as subexpressions, d) allow operators except for assignment operators, ++, -- or instanceof, and e) allow type casts to
- What are magic numbers and why do some consider them bad?
Symbolic Constant: When to replace? Magic: Unknown semantic Symbolic Constant -> Provides both correct semantic and correct context for use Semantic: The meaning or purpose of a thing "Create a constant, name it after the meaning, and replace the number with it " -- Martin Fowler First, magic numbers are not just numbers Any basic value can
- What is the difference between const and readonly in C#?
A const is a compile-time constant whereas readonly allows a value to be calculated at run-time and set in the constructor or field initializer So, a 'const' is always constant but 'readonly' is read-only once it is assigned
- Why can I change a constant object in JavaScript?
A constant array only means that the value of the pointer will not change - but in fact the data contained at that address is free to In javascript, you are allowed to call methods of constant objects (of course - otherwise constant objects would not serve much purpose!) These methods might have the side effect of modifying the object
- How to declare a class instance as a constant in C#?
50 Constants have to be compile time constant, and the compiler can't evaluate your constructor at compile time Use readonly and a static
- What does the PHP error message Use of undefined constant mean . . .
Using a constant that's not defined in this version of PHP, or is defined in an extension that's not installed There are some system-defined constants that only exist in newer versions of PHP, for example the mode option constants for round() such as PHP_ROUND_HALF_DOWN only exist in PHP 5 3 or later
- How can you define a static data member of type const std::string?
Inside class definitions you can only declare static members They have to be defined outside of the class For compile-time integral constants the standard makes the exception that you can "initialize" members It's still not a definition, though Taking the address would not work without definition, for example I'd like to mention that I don't see the benefit of using std::string over const
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