The relational operators group left-to-right.

relational-expression:The operands shall have arithmetic, enumeration, or pointer type.shift-expressionrelational-expression<shift-expressionrelational-expression>shift-expressionrelational-expression<=shift-expressionrelational-expression>=shift-expression

The
operators < (less than), > (greater than), <=
(less than or equal to), and >= (greater than or equal to) all
yield false or true.

The type of the result is
bool.

The usual arithmetic conversions are performed on operands of arithmetic
or enumeration type.

If both operands are pointers, pointer
conversions and qualification conversions
are performed to bring
them to their composite pointer type.

After conversions, the operands shall have the same type.

Comparing unequal pointers to objects87
is defined as follows:

- If two pointers point to different elements of the same array, or to subobjects thereof, the pointer to the element with the higher subscript compares greater.
- If two pointers point to different non-static data members of the same object, or to subobjects of such members, recursively, the pointer to the later declared member compares greater provided the two members have the same access control and provided their class is not a union.
- Otherwise, neither pointer compares greater than the other.

If two operands p and q compare equal,
p<=q and p>=q both yield true and p<q and
p>q both yield false.

Otherwise, if a pointer p
compares greater than a pointer q, p>=q, p>q,
q<=p, and q<p all yield true and p<=q,
p<q, q>=p, and q>p all yield false.

Otherwise, the result of each of the operators is unspecified.

If both operands (after conversions) are of arithmetic or enumeration type, each
of the operators shall yield true if the specified relationship is true
and false if it is false.

An object that is not an array element is considered to belong to a
single-element array for this purpose; see [expr.unary.op].

A pointer past the last element of an array x of n elements
is considered to be equivalent to a pointer to a hypothetical element
x[n] for this purpose; see [basic.compound].