Printing the correct number of decimal points 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 

Answer 2

You were nearly there, need to use std::fixed as well, refer http://www.cplusplus.com/reference/iostream/manipulators/fixed/

#include <iostream> #include <iomanip>  int main(int argc, char** argv) {     float testme[] = { 0.12345, 1.2345, 12.345, 123.45, 1234.5, 12345 };      std::cout << std::setprecision(2) << std::fixed;      for(int i = 0; i < 6; ++i)     {         std::cout << testme[i] << std::endl;     }      return 0; } 

outputs:

0.12 1.23 12.35 123.45 1234.50 12345.00