Relational Operators

The relational operators group left-to-right, but this fact is not very useful; a<b<c (meaning (a<b)<c) does not mean what it seems to be ((a<b) and (b<c)), as in a normal mathematical expression.

relational-expression:
        expression < expression
        expression > expression
        expression <= expression
        expression >= expression

The operators < (less than), > (greater than), <= (less than or equal to) and >= (greater than or equal to) all yield 0 if the specified relation is false and 1 if it is true. The type of the result is integer. The usual arithmetic conversions are performed.

Two strings may be compared. Single characters are compared from the left to the right according to their codes in the machine's character set. Note that a string is always terminated by \0, so the shortest string is considered the smaller. Strings are equal only if their lengths as well as their contents are identical.

It is an error if the two operands are of different types, but if either argument in an relational expression is @ then the value is @. Lists and pointers cannot be compared using the relational operators.