floating point - How do you round off decimal places in C++?

Question

I need help rounding off a float value to one decimal place.

I know setprecision(x) and cout << precision(x). Both of which work if I wanted to round the entire float, but I am only interested in rounding the decimals to the tenths place.

Answer 1

There's another solution which doesn't require casting to int:

#include <cmath>

y = floor(x * 10d) / 10d