How can I change the precision of printing with the stl?

I want to print numbers to a file using the stl with the number of decimal places, rather than overall precision. So, if I do this: ``` int precision = 16; std::vector<double> thePoint(3); thePoint[0] = 86.3671436; thePoint[1] = -334.8866574; thePoint[2] = 24.2814; ofstream file1(tempFileName, ios::trunc); file1 << std::setprecision(precision) << thePoint[0] << "\\" << thePoint[1] << "\\" << thePoint[2] << "\\"; ``` I'll get numbers like this: ``` 86.36714359999999\-334.8866574\24.28140258789063 ``` What I want is this: ``` 86.37\-334.89\24.28 ``` In other words, truncating at two decimal points. If I set precision to be 4, then I'll get ``` 86.37\-334.9\24.28 ``` ie, the second number is improperly truncated. I do not want to have to manipulate each number explicitly to get the truncation, especially because I seem to be getting the occasional 9 repeating or 0000000001 or something like that that's left behind. I'm sure there's something obvious, like using the printf(%.2f) or something like that, but I'm unsure how to mix that with the stl << and ofstream.