While occasionally intended, this construction is often buggy.
Example:
int x = 18;
x *= 3/2; // doesn't change x because of the integer division result
This code should be replaced with:
int x = 18;
x *= 3.0/2;
In the inspection options, you can disable warnings for suspicious but possibly correct divisions, for example, when the dividend can't be calculated statically.
void calc(int d) {
int x = 18;
x *= d/2;
}
New in 2019.2