What's the difference between "bool" and "bool?"?
2016年10月5日 · Since bool is a value type (just as int, long, double, DateTime and some other types), it will always be initialized to a default value (false in the case of a bool, 0 in the case of …
Difference between _Bool and bool types in C? - Stack Overflow
2012年1月4日 · These data types were added in C99. Since bool wasn't reserved prior to C99, they use the _Bool keyword (which was reserved). bool is an alias for _Bool if you include …
python - Truth value of a Series is ambiguous. Use a.empty, a.bool ...
Just to add some more explanation to this statement: The exception is thrown when you want to get the bool of a pandas.Series: >>> import pandas as pd >>> x = pd.Series([1]) >>> bool(x) …
In C how much space does a bool (boolean) take up? Is it 1 bit, 1 …
2011年11月4日 · A bool takes in real 1 bit, as you need only 2 different values. However, when you do a sizeof (bool), it returns 1, meaning 1 byte. For practical reasons, the 7 bits remaining …
What is the difference between BOOL and bool? - Stack Overflow
2019年12月14日 · 46 In VC++ we have the data type “BOOL” which can assume the value TRUE or FALSE, and we have the data type “bool”, which can assume the value true or false. What …
Do the &= and |= operators for bool short-circuit? - Stack Overflow
2014年4月16日 · From C++11 5.17 Assignment and compound assignment operators: The behavior of an expression of the form E1 op = E2 is equivalent to E1 = E1 op E2 except that …
Best way to check for nullable bool in a condition expression (if ...)
I was wondering what was the most clean and understandable syntax for doing condition checks on nullable bools. Is the following good or bad coding style? Is there a way to express the …
How to add a boolean datatype column to an existing table in sql?
2016年10月25日 · 46 The answer given by Pரதீப் creates a nullable bool, not a bool, which may be fine for you. For example in C# it would create: bool? AdminApproved not bool …
What is the difference between bool and Boolean types in C#
2008年9月25日 · 2 bool is a primitive type, meaning that the value (true/false in this case) is stored directly in the variable. Boolean is an object. A variable of type Boolean stores a …
Using bitwise operators for Booleans in C++ - Stack Overflow
2008年8月24日 · Using bitwise operations for bool helps save unnecessary branch prediction logic by the processor, resulting from a 'cmp' instruction brought in by logical operations.