The boolean conversion operator for std::basic_istream is explicit. This means that instances of the type will not implicitly become a bool but can be converted to one explicitly, for instance by typing bool(infile). Explicit boolean conversion operators are considered for conditional statements, i.e. the expression parts of if, while etc. More info about contextual conversions … Read more
Use: >>> bool(1) True >>> bool(0) False >>> int(bool(1)) 1 >>> int(bool(0)) 0 Can convert back too. Or a clever hack that could be quicker would be: >>> not not 1 True >>> not not 0 False >>> Converting back: >>> int(not not 1) 1 >>> int(not not 0) 0 >>>
If all you want to show is the literal TRUE or FALSE, you can use the case statements like you had proposed. Since PostgreSQL treats TRUE, true, yes, on, y, t and 1 as true, I’d control how I’d want the output to look like. Where clause can be written like: select * from tablename … Read more
Try using IEnumerable<T>.Count(Func<T,bool>) from System.Linq, with T as bool, on a params method parameter. public static int CountTrue(params bool[] args) { return args.Count(t => t); } Usage // The count will be 3 int count = CountTrue(false, true, false, true, true); You can also introduce a this extension method: public static int TrueCount(this bool[] array) … Read more
Short answer, yes that is the proper way to send the JSON. You should not be placing anything other than a string inside of quotes. Long answer, It depends on the data type. For the Key, yes you have to use quotes but only for strings. Also, you can use single quotes if you want … Read more
Boolean is not a keyword, it is a function, and functions are just objects, that you can pass around. It is the same as: return arrayOfSheeps.filter(function(x){return Boolean(x)}).length; Since function(x){return f(x)} === f then you can simplify: return arrayOfSheeps.filter(Boolean).length;
There is no shorter way than what you currently have.
std::vector<bool> is not directly at fault here. The performance difference is ultimately caused by your use of the signed 32-bit int type in your loops and some rather poor register allocation by the compiler. Consider, for example, your innermost loop: for (int j = i*i; j <= n; j += i) isPrime[j] = false; Here, … Read more
In Java, if ( i != 0 ) is the idiomatic way to check whether the integer i differs from zero. If i is used as a flag, it should be of type boolean and not of type int.