Using stringstream precision to format floats but discarding zero-padding

Question

I'm trying to set precision (i.e. number of decimal places) of floats and long doubles to 10, but i don't want them zero padded. I.e.,

123456.789123456789 should give 123456.7891234568, but 123456 should not give 123456.0000000000, but rather 123456

So far i've narrowed it down to:

long double myNumber;
string myString;
ostringstream myStream;
myStream.setf(ios::fixed,ios::floatfield);
myStream.precision(10);
myStream << myNumber;
myString = myStream.str();

I've also tried fiddling with setfill(' ') and std::ws but can't really get the hang of it. Any suggestions?

Armen Tsirunyan · Accepted Answer · 2013-04-01 09:14:29Z

2

Don't use ios::fixed for ios::floatfield. That's what causes the padding. Simply use setprecision.

answered Apr 1, 2013 at 9:14

Armen Tsirunyan

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