In most programming languages, floating point numbers are represented a lot like scientific notation: with an exponent and a mantissa (also called the significand). A very simple number, say 9.2, is actually this fraction: 5179139571476070 * 2 -49 Where the exponent is -49 and the mantissa is 5179139571476070. The reason it is impossible to represent … Read more
Me, I’d do (‘%f’ % x).rstrip(‘0’).rstrip(‘.’) — guarantees fixed-point formatting rather than scientific notation, etc etc. Yeah, not as slick and elegant as %g, but, it works (and I don’t know how to force %g to never use scientific notation;-).
Granted, the answer I linked in the comments is not very helpful. You can specify your own string converter like so. In [25]: pd.set_option(‘display.float_format’, lambda x: ‘%.3f’ % x) In [28]: Series(np.random.randn(3))*1000000000 Out[28]: 0 -757322420.605 1 -1436160588.997 2 -1235116117.064 dtype: float64 I’m not sure if that’s the preferred way to do this, but it works. … Read more
The Wikipedia page on it is a good place to start. To sum up: float is represented in 32 bits, with 1 sign bit, 8 bits of exponent, and 23 bits of the significand (or what follows from a scientific-notation number: 2.33728*1012; 33728 is the significand). double is represented in 64 bits, with 1 sign … Read more
Editor’s Note: The following answer provides a simplistic solution that contains several implementation flaws (see Shafik Yaghmour’s answer for a full explanation). Note that C++11 includes std::round, std::lround, and std::llround as builtins already. There’s no round() in the C++98 standard library. You can write one yourself though. The following is an implementation of round-half-up: double … Read more
The bug is in the following two lines of System.ValueType: (I stepped into the reference source) if (CanCompareBits(this)) return FastEqualsCheck(thisObj, obj); (Both methods are [MethodImpl(MethodImplOptions.InternalCall)]) When all of the fields are 8 bytes wide, CanCompareBits mistakenly returns true, resulting in a bitwise comparison of two different, but semantically identical, values. When at least one field … Read more
If you just want to round the number for output purposes, then the “%.2f” format string is indeed the correct answer. However, if you actually want to round the floating point value for further computation, something like the following works: #include <math.h> float val = 37.777779; float rounded_down = floorf(val * 100) / 100; /* … Read more
You can pass the format in to the ToString method, e.g.: myFloatVariable.ToString(“0.00”); //2dp Number myFloatVariable.ToString(“n2”); // 2dp Number myFloatVariable.ToString(“c2”); // 2dp currency Standard Number Format Strings
There is a solution: <resources> <item name=”text_line_spacing” format=”float” type=”dimen”>1.0</item> </resources> In this way, your float number will be under @dimen. Notice that you can use other “format” and/or “type” modifiers, where format stands for: Format = enclosing data type: float boolean fraction integer … and type stands for: Type = resource type (referenced with R.XXXXX.name): … Read more
To check if a float value is a whole number, use the float.is_integer() method: >>> (1.0).is_integer() True >>> (1.555).is_integer() False The method was added to the float type in Python 2.6. Take into account that in Python 2, 1/3 is 0 (floor division for integer operands!), and that floating point arithmetic can be imprecise (a … Read more