how to apply std::setprecision while casting from float to double

Asked Feb 17 '17 at 14:28

Active Feb 17 '17 at 14:28

Viewed 45 times

I have the following float value that is being converted to double

float fVal = 0.0f;
double dVal = static_cast<double>(fVal);

I want to control the number of decimal places that dVal gets. I found std::setprecision. But, all examples demostrate its usage in std::couts.

How can apply std::setprecision here to get 2 or 3 decimal places of precision ?

asked Feb 17 '17 at 14:28

Lookup for `std::round()`. `std::setprecision` only controls output formatting. – πάντα ῥεῖ Feb 17 '17 at 14:30
`std::setprecision` only applies to I/O streams. It controls the text format for numbers, not numerical precision. – molbdnilo Feb 17 '17 at 14:31
Also, floating-point binary numbers don't really have *decimal* places. – molbdnilo Feb 17 '17 at 14:33

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