Question

I have this query in my C++ code:

 query << "UPDATE currency SET value= " << currencyValue

currencyValue is defined as “const double& currencyValue” and when I watch the value is

0.00045545105422339915

But if I check the value of the query then I get something like this

UPDATE currency SET value = 0.000455451

so decimals get missing…

Any ideas why?

Answer 1

You can try calling setprecision(10) (or any value you actually want) on your stream before outputting the double value to it.

You can do it like this:

#include <iomanip>
query << "UPDATE currency SET value= " << std::setprecision(10) << currencyValue;