Printing floating-point GPA in C++

Question

my problem is when I am trying to print a floating-point GPA in C++.

It seems like a simple issue, but I can't get it to work. Basically I have a floating point value set to 4.0 for a GPA. However, when I try to print it like this:

cout << gpa << endl;

I get the value of 4. Without the .0 on the end. However, I want the .0 to show up. I have tried setting a precision but with no luck. Any help is appreciated.

Lol - I know how to do this with printf, but not cout. Too much C for me I guess. I know it's a formatting issue. — Michael Dorgan, Jun 06 '13 at 22:07
I know, I can do the same with printf, but I cannot figure it out with cout. Very frustrating! — sethcarlton, Jun 06 '13 at 22:11

score 1 · Answer 1 · answered Jun 06 '13 at 22:13

    #include <iomanip>
    ...
    cout.setf(ios::fixed);                                  // use fixed-point notation
    cout.setf(ios::showpoint);                              // show decimal point
    cout.precision(1);
    ...
    cout << gpa << endl;

score 1 · Accepted Answer · answered Jun 06 '13 at 22:15

1

You can use std::fixed in conjunction with std::setprecision

#include <iostream> // std::fixed
#include <iomanip> // std::setprecision

int main() {
  double gpa = 4.0;
  std::cout << std::fixed << std::setprecision(1) << gpa << std::endl;
  return 0;
}

// Output is 4.0

answered Jun 06 '13 at 22:15

Garee

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This worked like a charm! Just needed the fixed-point notation. Thanks! – sethcarlton Jun 06 '13 at 22:20

Printing floating-point GPA in C++

2 Answers2