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3.3 Relational Expressions
Relational expressions are a special kind of expression that always
evaluate to 0 or 1, 0 if the relation is false and 1 if the relation is
true. These may appear in any legal expression. (POSIX bc
requires that relational expressions are used only in if
,
while
, and for
statements and that only one relational
test may be done in them.) The relational operators are

expr1 < expr2
The result is 1 if expr1 is strictly less than expr2.

expr1 <= expr2
The result is 1 if expr1 is less than or equal to expr2.

expr1 > expr2
The result is 1 if expr1 is strictly greater than expr2.

expr1 >= expr2
The result is 1 if expr1 is greater than or equal to expr2.

expr1 == expr2
The result is 1 if expr1 is equal to expr2.

expr1 != expr2
The result is 1 if expr1 is not equal to expr2.