Display number with decimal places instead of whole number

Question

I have this

double a = 4.0;
double b = 2.0;
double g = a + b;

std::cout << g;

I am getting 6, but I want to get 6.0

Answer 1

One way:

#include 
//...
std::cout << std::setprecision(2) << g;

This sets the precision of the output to 2 significant figures.

Edit: as the other answer points out, prepend std::setprecision with std::fixed.