Be careful when you convert back and forth with boolean, the manual says: A boolean TRUE value is converted to the string “1”. Boolean FALSE is converted to “” (the empty string). This allows conversion back and forth between boolean and string values. So you need to do a: echo (int)$local_rates_file_exists.”<br>”;
TL:DR: current compilers still have bool missed-optimizations when doing stuff like (a&&b) ? x : y. But the reason why is not that they don’t assume 0/1, they just suck at this. Many uses of bool are for locals, or inline functions, so booleanizing to a 0 / 1 can optimize away and branch (or … Read more
Java, unlike languages like C and C++, treats boolean as a completely separate data type which has 2 distinct values: true and false. The values 1 and 0 are of type int and are not implicitly convertible to boolean.
How about using the C++ language itself? bool t = true; bool f = false; std::cout << std::noboolalpha << t << ” == ” << std::boolalpha << t << std::endl; std::cout << std::noboolalpha << f << ” == ” << std::boolalpha << f << std::endl; UPDATE: If you want more than 4 lines of code … Read more
Try (depending on what result type you want): Boolean boolean1 = Boolean.valueOf(“true”); boolean boolean2 = Boolean.parseBoolean(“true”); Advantage: Boolean: this does not create new instances of Boolean, so performance is better (and less garbage-collection). It reuses the two instances of either Boolean.TRUE or Boolean.FALSE. boolean: no instance is needed, you use the primitive type. The official … Read more
It has to do with operator precedence in Python (the interpreter thinks you’re comparing True to not, since == has a higher precedence than not). You need some parentheses to clarify the order of operations: True == (not False) In general, you can’t use not on the right side of a comparison without parentheses. However, … Read more
The operators &, ^, and | are bitwise operators when the operands are primitive integral types. They are logical operators when the operands are boolean, and their behaviour in the latter case is specified. See the section 15.22.2 of the Java Language Specification for details.
if(stop = true) should be if(stop == true), or simply (better!) if(stop). This is actually a good opportunity to see a reason to why always use if(something) if you want to see if it’s true instead of writing if(something == true) (bad style!). By doing stop = true then you are assigning true to stop … Read more
From help(“<“): If the two arguments are atomic vectors of different types, one is coerced to the type of the other, the (decreasing) order of precedence being character, complex, numeric, integer, logical and raw. So in this case, the numeric is of lower precedence than the character. So 2 is coerced to the character “2”. … Read more
Typically, a value of false is represented by 0 and a value of true is represented by any non-0 integer value. The specific value for true and false (among others) are things that you shouldn’t rely on – they can potentially be implementation specific. I’m not sure what you are trying to do, but it … Read more