How to specify setprecision rounding

Question

Can I specify setprecision to round double values when stream to std output?

ofile << std::setprecision(12) << total_run_time/TIME << \"\\n         


        

Answer 1

Another approach is to defeat the rounding by subtracting, in your second case, 0.000005 from the double before outputting it:

total_run_time / TIME - 0.000005

In many ways I prefer this as it avoids the potential for integer overflow.