Printing the correct number of decimal places with cout

Question

I have a list of float values and I want to print them with cout with 2 decimal places.

For example:

• 10.900 should be printed as 10.90
• 1.000 should be printed as 1.00
• 122.345 should be printed as 122.34

How can I do this?

(setprecision doesn't seem to help in this.)

Answer 1

With <iomanip>, you can use std::fixed and std::setprecision

Here is an example

#include <iostream>
#include <iomanip>

int main()
{
    double d = 122.345;

    std::cout << std::fixed;
    std::cout << std::setprecision(2);
    std::cout << d;
}

And you will get output

122.34