Does casting double to int returns the round down number?

Question

I have the folowing example :

double x = 2.5;
int n = (int)x;
int k = (int) floor(x);

Does casting double to int returns the round down number? or I should use floor function?

Answer 1

Be careful with negative numbers. Casting will truncate towards 0. floor will truncate towards negative infinite.

If the value is positive, then both methods return the same truncated value.