Question

I have a function that is supposed to return a formatted string (hh:mm:sec.xxx)
I want the output to display 2 places for hours, 2 places for minutes, and 5 places for seconds (truncated microseconds);

My code:

#include <iostream>
#include <iomanip>

std::string getTime(uint64_t time){ //input is in microseconds

unit64_t tempTime = time;
unit64_t hours = (tempTime / 3600000000);
tempTime -= (hours * 3600000000);

unit64_t mins = (tempTime / 60000000);
tempTime -= (mins * 60000000);

double secs = ((double)tempTime / 1000000);

std::string strTime;

 stringstream ss;
 ss << std::setprecision(2)<<hours<<":"
    << std::setprecision(2)<<mins <<":"
    << std::setprecision(2)<<std::setprecision(2)<<secs; 

 strTime = ss.str();
 return strTime;

}

could somebody please show me the proper syntax for inputting the values to ss. It compiles and works but I do not get the format I want.

I just now typed this up for this question so if you see typos please forgive me

Answer 1

You forgot about minutes and you probably want 0 decimal precision. Try:

ss << std::setw(2) << std::setfill('0') << std::setprecision(0) << hours << ":" 
   << mins << ":" 
   << std::setprecision(3) << secs;