A BigDecimal is an exact way of representing numbers. A Double has a certain precision. Working with doubles of various magnitudes (say d1=1000.0 and d2=0.001) could result in the 0.001 being dropped alltogether when summing as the difference in magnitude is so large. With BigDecimal this would not happen. The disadvantage of BigDecimal is that … Read more
Using Math.round() will round the float to the nearest integer.
First of all, floating point values are not “random” in their behavior. Exact comparison can and does make sense in plenty of real-world usages. But if you’re going to use floating point you need to be aware of how it works. Erring on the side of assuming floating point works like real numbers will get … Read more
You can set the precision directly on std::cout and use the std::fixed format specifier. double d = 3.14159265358979; cout.precision(17); cout << “Pi: ” << fixed << d << endl; You can #include <limits> to get the maximum precision of a float or double. #include <limits> typedef std::numeric_limits< double > dbl; double d = 3.14159265358979; cout.precision(dbl::max_digits10); … Read more
float_num.toFixed(2); Note:toFixed() will round or pad with zeros if necessary to meet the specified length.
Python 3.5 adds the math.isclose and cmath.isclose functions as described in PEP 485. If you’re using an earlier version of Python, the equivalent function is given in the documentation. def isclose(a, b, rel_tol=1e-09, abs_tol=0.0): return abs(a-b) <= max(rel_tol * max(abs(a), abs(b)), abs_tol) rel_tol is a relative tolerance, it is multiplied by the greater of the … Read more
There are functions to round numbers. For example: var x = 5.0364342423; print(x.toFixed(2)); will print 5.04. EDIT: Fiddle
You can use toFixed() to do that var twoPlacedFloat = parseFloat(yourString).toFixed(2)
Huge difference. As the name implies, a double has 2x the precision of float[1]. In general a double has 15 decimal digits of precision, while float has 7. Here’s how the number of digits are calculated: double has 52 mantissa bits + 1 hidden bit: log(253)÷log(10) = 15.95 digits float has 23 mantissa bits + … Read more
“%f” is the (or at least one) correct format for a double. There is no format for a float, because if you attempt to pass a float to printf, it’ll be promoted to double before printf receives it1. “%lf” is also acceptable under the current standard — the l is specified as having no effect … Read more