For the hashCode of an int the most natural choice is to use the int itself. A better question is what to use for the hashCode of a long since it doesn’t fit into the int-sized hashcode. Generally, your best source for that—and all hashCode-related questions—would be Effective Java. Here’s what Effective Java recommends (and … Read more
It does not round, it just returns the integral part before the decimal point. Reference (thanks Rawling) Explicit Numeric Conversions Table: When you convert a double or float value to an integral type, this value is rounded towards zero to the nearest integral value. You can try simple issues like this by yourself by writing … Read more
No, there is and has never been an explicit built in option for conversion of Int to Bool, see the language reference for Bool for details. There exists, still, however, an initializer by NSNumber. The difference is that implicit bridging between Swift numeric type and NSNumber has been removed in Swift 3 (which previously allowed … Read more
You are missing the parentheses of the method call: ToString() Without the parentheses, the expression is a method group — that is, a reference to one or more overloaded methods.
long oneYearWithL = 1000*60*60*24*365L; long oneYearWithoutL = 1000*60*60*24*365; Your first value is actually a long (Since 365L is a long, and 1000*60*60*24 is an integer, so the result of multiplying a long value with an integer value is a long value. But 2nd value is an integer (Since you are mulitplying an integer value with … Read more
Update: The answer below still applies in principle, but Swift 4 completed a redesign of the numeric protocols, such that adding your own is often unnecessary. Take a look at the standard library’s numeric protocols before you build your own system. This actually isn’t possible out of the box in Swift. To do this you’ll … Read more
In Postgresql int and int4 are aliases for integer, a signed four-byte integer http://www.postgresql.org/docs/current/static/datatype.html#DATATYPE-TABLE
Change try { myNum = Integer.parseInt(myString.getText().toString()); } catch(NumberFormatException nfe) { to try { myNum = Integer.parseInt(myString); } catch(NumberFormatException nfe) {
Yes, it’s valid – it will promote the int to a double before performing the comparison. See JLS section 15.20.1 (Numerical Comparison Operators) which links to JLS section 5.6.2 (Binary Numeric Promotion). From the latter: Widening primitive conversion (§5.1.2) is applied to convert either or both operands as specified by the following rules: If either … Read more
Use the function string_of_int (see the documentation for Pervasives, the module containing the functions that are automatically made available in the top level namespace to al OCaml programs).