The integral part of the
f64 is over the limit of the
i32. I have the corresponding C++ code.
// compiler - g++ // version - 10.2.0 // standard - C++14 int32_t n_int = (long int) round(n_double);
Can you show me the rust code which does exactly this?
I tried using wraps. But instead of wrapping around, the variable takes a limit of
i32, i.e. either
-2147483648 depending on the sign of the
The other ways I considered were to
- Just keep the least significant 32 bits (I know how to do this for an i64, but not an f64, also when truncated, we need to worry about the sign and the twos complement).
- Subtract the limit over and over till the number gets under the limit (I don't know if I should consider MAX or MAX-MIN or something else).
I'm not sure if either method does exactly what the C code does (even in the extreme/corner cases).
Very good solutions below. I'll just mark this for future reference.