Set precision with fstream to output file - format double

Question

I cannot find an answer for how I might use an already opened fstream to output formatted doubles to a text file. Currently my code is doing this:

int writeT         


        

Answer 1

Try using

#include <iomanip>  // std::setprecision()

f << fixed << setprecision(2) << endl;

set precision sets the number of significant digits, not the number of decimals places. For example

cout << setprecision(3) << 12.3456 << endl;

would output 12.3
Sending in fixed first makes it so you are setting the precision from a fixed position (the decimal place) rather than from the first digit of the floating point value.