greater than and less than

Question

We can use equal = and not equal != but
why we can't use not greater than !> and not less than !< ???

Answer 1

Because those operators aren't defined and you can simply use the inverse or negate the final comparison.

But if you insist try !(a>b) instead of (a<b). They are equal in most respects, except the former is a tiny faction less efficient.

Answer 2

The negation of "greater than" (>) is "less than or equal to" (<=), and viceversa.

The negation of "less than" (<) is "greater than or equal to" (>=), and viceversa.

[Python]

print(4>2) # True
print(4<=2) # False

print(4<2) # False
print(4>=2) # True

Answer 3

And remember "=" is the assignment operator. "==" means "equals".

Answer 4

Not greater than or equal to is equivalent to less than.

Not less than or equal to is equivalent to more than.

And You want to do: if (!(f>=0))... This