How do I display more decimals in the output console?

Question

I want to output the value of a double in it's full precision. However, when using the cout function, it only displays the first 6 digits even though there is around 15-16 digits of precision.

How do I get my program to display the entire value, including the magnitude (power) component?

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;

Answer 2

you could use something like this :

#include <iomanip>

cout << setprecision (9) << double_value << endl;

more iomanipulators, here

Answer 3

You're looking for setprecision (code taken from link):

int main () {
  double f =3.14159;
  cout << setprecision(15) << f << endl;
  return 0;
}