How do I display more decimals in the output console? [duplicate]

Answer 1

Use the setprecision() manipulator:

http://www.cplusplus.com/reference/iostream/manipulators/setprecision/

You can also force scientific notation with the scientific manipulator:

http://www.cplusplus.com/reference/iostream/manipulators/scientific/

cout << scientific << setprecision(15) << my_number << endl;