How do I print a double value with full precision using cout?
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);
cout << "Pi: " << d << endl;
How to get the difference between two dictionaries in Python?
Try the following snippet, using a dictionary comprehension:
value = { k : second_dict[k] for k in set(second_dict) - set(first_dict) }
In the above code we find the difference of the keys and then rebuild a dict
taking the corresponding values.
How do I display a decimal value to 2 decimal places?
decimalVar.ToString("#.##"); // returns ".5" when decimalVar == 0.5m
or
decimalVar.ToString("0.##"); // returns "0.5" when decimalVar == 0.5m
or
decimalVar.ToString("0.00"); // returns "0.50" when decimalVar == 0.5m
How to make lists contain only distinct element in Python?
The simplest is to convert to a set then back to a list:
my_list = list(set(my_list))
One disadvantage with this is that it won't preserve the order. You may also want to consider if a set would be a better data structure to use in the first place, instead of a list.
Printing double values accordingly in java
try to use this format: "#0.##"
Java:Why should we use BigDecimal instead of Double in the real world?
It's called loss of precision and is very noticeable when working with either very big numbers or very small numbers. The binary representation of decimal numbers with a radix is in many cases an approximation and not an absolute value. To understand why you need to read up on floating number representation in binary. Here is a link: http://en.wikipedia.org/wiki/IEEE_754-2008. Here is a quick demonstration:
in bc (An arbitrary precision calculator language) with precision=10:
(1/3+1/12+1/8+1/15) = 0.6083333332
(1/3+1/12+1/8) = 0.541666666666666
(1/3+1/12) = 0.416666666666666
Java double:
0.6083333333333333
0.5416666666666666
0.41666666666666663
Java float:
0.60833335
0.5416667
0.4166667
Related Topics
After Getting Image from Uiimagepickercontroller, Uiimageview Rotates Image for iPhone 5
Swift Alamofire Return Value Is Empty
Cannot Stop Background Music from Within Game Scenes, Swift 3/Spritekit
Why Can't I Use 'Type' as the Name of an Enum Embedded in a Struct
Swift:Program for Addition of 2 Numbers Using Closure
Handle Single Click and Double Click While Updating the View
Url Constructor Doesn't Work with Some Characters
Arkit Setting Worldtrackingconfiguration to Gravityandheading Produces Error
Error "{ Expected After If Statement"
Structuring Data for Chat App in Firebase
Swift Function Compiler Error 'Missing Return'
What Does This Mean? Variable Declared Followed by a Block Without Assignment
Nsurl Fail Able Initialiser Initwithstring: Does Not Return Nil on Empty String in Swift
How to Move a Model and Generate Its Collision Shape at the Same Time
Compare Value from Two Struct in Swift
Initializer for Conditional Binding Must Have Optional Type, Not '[String:Any]'