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.The double not in this case is quite simple.It is simply two not s back to back.The first one simply inverts the truthy or falsy value, resulting in an actual boolean type, and then the second one …From what i have read, a value of data type double has an approximate precision of 15 decimal places.However, when i use a number whose decimal representation repeats, such as 1. 0/7. 0, i find thaIn my earlier question i was printing a double using cout that got rounded when i wasn't expecting it.
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How can i make cout print a double using full precision?A similar question for c/c++ (as this may be the top search engine hit):How can i get double quotes into a string literal?