This question already has answers here: How do you create a yes/no boolean field in SQL server? (11 answers) Closed 1 year ago. Is there a Boolean data type in Microsoft SQL Server like there is in MySQL? If not, what is the alternative in MS SQL Server? 9 Answers 9
Is there a really easy way to toggle a boolean value in javascript? So far, the best I’ve got outside of writing a custom function is the ternary: bool = bool ? false : true; 8 s 8
An interviewer recently asked me this question: given three boolean variables, a, b, and c, return true if at least two out of the three are true. My solution follows: boolean atLeastTwo(boolean a, boolean b, boolean c) { if ((a && b) || (b && c) || (a && c)) { return true; } else{ … Read more
Since ANSI C99 there is _Bool or bool via stdbool.h. But is there also a printf format specifier for bool? I mean something like in that pseudo code: bool x = true; printf(“%B\n”, x); which would print: true 8 s 8 There is no format specifier for bool types. However, since any integral type shorter … Read more
I want to filter my dataframe with an or condition to keep rows with a particular column’s values that are outside the range [-0.25, 0.25]. I tried: df = df[(df[‘col’] < -0.25) or (df[‘col’] > 0.25)] But I get the error: Truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all() … Read more
C doesn’t have any built-in boolean types. What’s the best way to use them in C? 18 s 18 From best to worse: Option 1 (C99 and newer) #include <stdbool.h> Option 2 typedef enum { false, true } bool; Option 3 typedef int bool; enum { false, true }; Option 4 typedef int bool; #define … Read more
I would like to use argparse to parse boolean command-line arguments written as “–foo True” or “–foo False”. For example: my_program –my_boolean_flag False However, the following test code does not do what I would like: import argparse parser = argparse.ArgumentParser(description=”My parser”) parser.add_argument(“–my_bool”, type=bool) cmd_line = [“–my_bool”, “False”] parsed_args = parser.parse(cmd_line) Sadly, parsed_args.my_bool evaluates to True. … Read more
Does anyone know how to do convert from a string to a boolean in Python? I found this link. But it doesn’t look like a proper way to do it. I.e. using built-in functionality, etc. The reason I’m asking this is because I learned about int(“string”) from here. But when trying bool(“string”) it always returns … Read more
I tried to declare a Boolean variable in a shell script using the following syntax: variable=$false variable=$true Is this correct? Also, if I wanted to update that variable would I use the same syntax? Finally, is the following syntax for using Boolean variables as expressions correct? if [ $variable ] if [ !$variable ] 2 … Read more
Since MySQL doesn’t seem to have any ‘boolean’ data type, which data type do you ‘abuse’ for storing true/false information in MySQL? Especially in the context of writing and reading from/to a PHP script. Over time I have used and seen several approaches: tinyint, varchar fields containing the values 0/1, varchar fields containing the strings … Read more