When comparing for equality is it okay to use `==`?

Question

When comparing for equality is it okay to use ==?

For example:

int a = 3;
int b = 4;

If checking for equality should you use:

if (a == b)
{
     . . .
}

Would the situation change if floating point numbers were used?

Answer 1

'==' is perfectly good for integer values.

You should not compare floats for equality; use an tolerance approach:

if (fabs(a - b) < tolerance)
{
   // a and b are equal to within tolerance
}

Answer 2

Re floating points: yes. Don't use == for floats (or know EXACTLY what you're doing if you do). Rather use something like

if (fabs(a - b) < SOME_DELTA) {
  ...
}

EDIT: changed abs() to fabs()