The type of a literal without the m suffix is double – it’s as simple as that. You can’t initialize a float that way either: float x = 10.0; // Fail The type of the literal should be made clear from the literal itself, and the type of variable it’s assigned to should be assignable … Read more
Double is an object and double is a primitive data type. See this answer for more details. The Double class wraps a value of the primitive type double in an object. An object of type Double contains a single field whose type is double. Source: http://docs.oracle.com/javase/7/docs/api/java/lang/Double.html
You don’t even need to assume IEEE. C89 says in 3.1.2.5: The set of values of the type float is a subset of the set of values of the type double And every other C and C++ standard says equivalent things. As far as I know, NaNs and infinities are “values of the type float“, … Read more
As you can see from the results below, using java.lang.Math is faster for floats than for doubles, and faster than FloatMath. Furthermore, FloatMath has no .exp() or .pow() prior to API level 17. On a Samsung GT_i9295 (4.2.2), 2^24 cycles Math.exp(D) Total: 7405 ms, Per Op: 0.0004414 ms (F)Math.exp(F) Total: 5153 ms, Per Op: 0.0003071 … Read more
No, an IEEE 754 double-precision floating point number is always 64 bits. Similarly, a single-precision float is always 32 bits. If your question is about C# and/or .NET specifically (as your tag would indicate), all of the data type sizes are fixed, independent of your system architecture. This is the same as Java, but different … 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
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
Try: var numberOfBottles = totalVolume / volumeEachBottles numberOfBottles.rounded(.up) or numberOfBottles.rounded(.down)
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 (ยง5.1.2) is applied to convert either or both operands as specified by the following rules: If either … Read more