Wrong	Right
Using = not ==
if ( a = b )
The expression on the left set a to equal b, the one on the right tests to see if a equals b.
Using a == b == c or a >b > c
Wrong	Right
if (a == b == c)
if ( a > b > c )
Not using `else`
Wrong	Right

Wrong	Right
Comparing floating-point numbers for equality
Rounding errors mean that two floating-point expressions are unlikely to be equal even when mathematically they ought to be. Instead we use `fabs()` of the difference. Note `fabs()` not `abs()` which is the integer function.

Using `abs()` not `fabs()` Remember that `abs()` is the integer so any floating-point expression whose absolute value is less than one will become zero.
	// (This is the same as the previous example.)
Longer example of comparing floating-point numbers for equality

Common mistakes with conditionalss

Using the wrong expression