What you have is already a floating point number, they’re all 64-bit floating point numbers in JavaScript. To get decimal places when rendering it (as a string, for output), use .toFixed(), like this: function intToFloat(num, decPlaces) { return num.toFixed(decPlaces); } You can test it out here (though I’d rename the function, given it’s not an … Read more
To the first question: there’s no hardware support for float16 on a typical processor (at least outside the GPU). NumPy does exactly what you suggest: convert the float16 operands to float32, perform the scalar operation on the float32 values, then round the float32 result back to float16. It can be proved that the results are … Read more
IEEE 754 floating point numbers use a sign bit for signed-ness (rather than something like twos complement), so if you’re sure that your compiler/platform uses that representation (very common) then you can use -std::numeric_limits<float>::max() as you suspected.
Note: The python implementation changed between 2.7 and 3.x. I corrected the answer accordingly. For the sake of completeness, let me add two more functions to your question and explain the differences between float(int(x)), math.floor(x), round(x) and math.ceil(x). Let’s start with a question: “What integer represents best the number 1.6?” We have two possible answers … Read more
Since you’re on an embedded platform, it’s quite possible that you don’t have the full range of capabilities from the printf()-style functions. Assuming you have floats at all (still not necessarily a given for embedded stuff), you can emulate it with something like: char str[100]; float adc_read = 678.0123; char *tmpSign = (adc_read < 0) … Read more
You should use “R” format string: https://msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.110).aspx. https://msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.110).aspx#RFormatString “R” or “r” Round-trip Result: A string that can round-trip to an identical number. Supported by: Single, Double, and BigInteger. Precision specifier: Ignored. float maxFloat = float.MaxValue; string s = maxFloat.ToString(“R”); // <- “R” float result = float.Parse(s); bool mustEqual = (maxFloat == result);
It’s not actually zero, but it might look like zero if you inspect it using printf or NSLog by using %f. According to float.h (at least in Mac OS X 10.6.2), FLT_MIN is described as: /* Minimum normalized positive floating-point number, b**(emin – 1). */ Note the positive in that sentence: FLT_MIN refers to the … Read more
You’re dividing integers, which means that you’re using integer division. In integer division the fractional part of the result is thrown away. Try the following: float res = (float) quantity / standard; ^^^^^^^ The above forces the numerator to be treated as a float which in turn promotes the denominator to float as well, and … Read more
Here is a near O(1) solution for a Fibonacci sequence term. Admittedly, O(log n) depending on the system Math.pow() implementation, but it is Fibonacci w/o a visible loop, if your interviewer is looking for that. The ceil() was due to rounding precision on larger values returning .9 repeating. Example in JS: function fib (n) { … Read more