What you are missing here: the int values in your example go on the stack, not on the heap. And it is much less overhead to deal with fixed size primitive values existing on the stack – compared to objects on the heap! In other words: using a “pointer” means that you have to create … Read more
From the JLS 5.2 Assignment Conversion In addition, if the expression is a constant expression (ยง15.28) of type byte, short, char, or int: – A narrowing primitive conversion may be used if the type of the variable is byte, short, or char, and the value of the constant expression is representable in the type of … Read more
Remember that the Python int type does not have a limited range like C int has; the only limit is the available memory. Memory goes to storing the value, the current size of the integer storage (the storage size is variable to support arbitrary sizes), and the standard Python object bookkeeping (a reference to the … Read more
That’s because integers don’t have values for +/-Inf, NaN, and don’t allow division by 0, while floats do have those special values.
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.
Why 28 bytes initially for any value as low as 1? I believe @bgusach answered that completely; Python uses C structs to represent objects in the Python world, any objects including ints: struct _longobject { PyObject_VAR_HEAD digit ob_digit[1]; }; PyObject_VAR_HEAD is a macro that when expanded adds another field in the struct (field PyVarObject which … Read more
If you only deal with integers, you can use str.isdigit(): Return true if all characters in the string are digits and there is at least one character, false otherwise. [row for row in listOfLists if row[x].isdigit()] Or if negative integers are possible (but should be allowed): row[x].lstrip(‘-‘).isdigit() And of course this all works only if … Read more
The underlying type is indeed the same, but the compiler depends on the type to be as the exact alias. This is a compilation error based on parsing. I took a look at C# grammar specification and the underlying types defined there as tokens based on the alias (e.g. ‘int’, ‘unit’… etc.). The parser expects … Read more
Edit: if, like me, you’ve been using more Kotlin than Java, it’d also be relevant to know that IntelliJ also has an inspection for this in Kotlin: Variable used only in following return and should be inlined This inspection reports local variables either used only in the very next return statement or exact copies of … Read more