!= 0 should only be used for ints / floats / 'numbers'. Comparing it to false requires me to know that false is 0. Comparing it to a ptr requires me to know th

!= 0 should only be used for ints / floats / 'numbers'. Comparing it to false requires me to know that false is 0. Comparing it to a ptr requires me to know that 0 represents a pointer pointing to nothing.