Answer 1

You need to use setprecision() on the cout object.

http://www.cplusplus.com/reference/iomanip/setprecision/

ex: std::setprecision(numberofdigits);

Answer 2

-A detailed tutorial on data types

https://www.tutorialspoint.com/cplusplus/cpp_data_types.htm

Answer 3

Calculations in double are more precise but to output the result with a given number of digits you need to precise it....

Answer 4

Yes. You need to format the output.

Answer 5

Each Data type in C++ such a number types int, double , float, long double, have ranges.

Answer 6

double will not display extra zeros

eg 14.0 - float would display the zero though

Answer 7

if you want a variable to have a certain amount of digits used the right data type for the job

Answer 8

@Christos

if you give the value long (long doub) 12.0001

that number will be displayed

if you give 12.000

double will ignore the zeros and output 12

Answer 9

Here is a example

https://code.sololearn.com/cBga5IERN57L/?ref=app

Answer 10

My mistake that code takes the remainer of what is not covered in a data type.

max ranger if no value for a range