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Double length sling Several other people have mentioned performance isssues. double d = ((double) num) / denom; But is there another way to get the correct double result? I don't like casting primitives, who knows what may happen. Can anyone help? Mar 22, 2012 · 12 How can I realiably check if a variable is a double? You need to be clearer about what you're really trying to do here. That would be exactly last on my list of considerations. The word double derives from the fact that a double-precision number uses twice as many bits as a regular floating-point number. If the numbers you are using will commonly exceed the value of a float, then use a double. Jun 12, 2011 · A Double in Java is the class version of the double basic type - you can use doubles but, if you want to do something with them that requires them to be an object (such as put them in a collection), you'll need to box them up in a Double object. From what I have read, a value of data type double has an approximate precision of 15 decimal places. I don't think you're asking what you think you're asking, and it's worth being aware of the differences in terminology. using one or the other does not seem to affec The 53 bits of double s give about 16 digits of precision. using one or the other does not seem to affec Oct 20, 2017 · From what I have read, a value of data type double has an approximate precision of 15 decimal places. If you've got a variable which is declared to be of type double, then it's definitely a double. 947368421052631526 However, the former is correct. 947368421052631578, and 947368421052631578 is the repeating decimal. Dec 31, 2021 · I've read about the difference between double precision and single precision. In my earlier question I was printing a double using cout that got rounded when I wasn't expecting it. Note the difference between the Double class and the double primitive. The term double precision is something of a misnomer because the precision is not really double. How can I make cout print a double using full precision? Jul 2, 2009 · A double has a much higher precision due to it's difference in size. 0, I find tha 494 A Double is not an Integer, so the cast won't work. The 24 bits of float s give about 7 digits of precision. Using double I get 0. Apr 22, 2015 · Possible Duplicate: long double vs double I am unable to understand the difference between between long double and double in C and C++. Dec 31, 2021 · I've read about the difference between double precision and single precision. Why such an inco Nov 11, 2012 · Possible Duplicate: Java : different double and Double in comparison In a sample java program for one of my labs, I have two different methods taking Double and double parameters respectively. . However, when I use a number whose decimal representation repeats, such as 1. 0/7. Correctness should be your #1 consideration. Jun 19, 2012 · Using long double I get 18/19 = 0. However, in most cases, float and double seem to be interchangeable, i. Also note that a Double is a Number, so it has the method intValue, which you can use to get the value as a primitive int. Format %lf in printf was not supported in old (pre-C99) versions of C language, which created superficial "inconsistency" between format specifiers for double in printf and scanf. e. For example, if a single-precision number requires 32 bits, its double-precision counterpart will be 64 bits long.