Numbers after decimal point

Question

What is the function for defining the number 0 after decimal point in c++
For example:
double a;
a=3.000
std::cout << a; // it will print 3 in console.
what function should I add to this program to print
3.000

Answer 1

You need to:-
#include <iomanip>

cout << showpoint << setprecision(4) << a << endl;