How do I format a Double to a String in C# so as to have only two decimal places? If I use String.Format(“{0:0.00}%”, myDoubleValue) the number is then rounded and I want a simple truncate without any rounding. I also want the conversion to String to be culture sensitive. 15 Answers 15
Recently I have had to serialize a double into text, and then get it back. The value seems to not be equivalent: double d1 = 0.84551240822557006; string s = d1.ToString(“R”); double d2 = double.Parse(s); bool s1 = d1 == d2; // -> s1 is False But according to MSDN: Standard Numeric Format Strings, the “R” … Read more
I need to store a double as a string. I know I can use printf if I wanted to display it, but I just want to store it in a string variable so that I can store it in a map later (as the value, not the key). 17 Answers 17
I’m trying to make a calculator of growth rate (Double) that will round the result to the nearest Integer and recalculate from there, as such: let firstUsers = 10.0 let growth = 0.1 var users = firstUsers var week = 0 while users < 14 { println(“week \(week) has \(users) users”) users += users * … Read more
Today, I was looking through some C++ code (written by somebody else) and found this section: double someValue = … if (someValue < std::numeric_limits<double>::epsilon() && someValue > -std::numeric_limits<double>::epsilon()) { someValue = 0.0; } I’m trying to figure out whether this even makes sense. The documentation for epsilon() says: The function returns the difference between 1 … Read more
The float data type is a single-precision 32-bit IEEE 754 floating point and the double data type is a double-precision 64-bit IEEE 754 floating point. What does it mean? And when should I use float instead of double or vice-versa? 9 Answers 9
I would like to know how to convert a string containing digits to a double. 3 Answers 3
I want to parse a string like “3.5” to a double. However, double.Parse(“3.5”) yields 35 and double.Parse(“3.5”, System.Globalization.NumberStyles.AllowDecimalPoint) throws a FormatException. Now my computer’s locale is set to German, wherein a comma is used as decimal separator. It might have to do something with that and double.Parse() expecting “3,5” as input, but I’m not sure. … Read more
What is the biggest “no-floating” integer that can be stored in an IEEE 754 double type without losing precision ? 8 Answers 8
I want to print a double value in Java without exponential form. double dexp = 12345678; System.out.println(“dexp: “+dexp); It shows this E notation: 1.2345678E7. I want it to print it like this: 12345678 What is the best way to prevent this? 16 Answers 16
