FORTRAN Reference Manual

Expressions

FORTRAN Reference Manual—528615-001

3-7

Relational Expressions

A relational expression compares the values of two arithmetic or two character

operands. Relational expressions can appear only within logical expressions. The

evaluation of a relational expression produces a logical type result, whose value is

either true or false.

The syntax of a relational expression is:

expression

is an arithmetic or character expression.

rel-operator

is one of

.LT.

.LE.

.EQ.

.NE.

.GT.

.GE.

A relational expression has a value of .TRUE. only if the values of the operands satisfy

the relation specified by the operator. Its value is .FALSE. otherwise.

expression rel-operator expression

Table 3-4. Relational Operators

Operator Operation Example Meaning

.LT. Less than A .LT. B Is A less than B?

.LE. Less than or equal to A .LE. B Is A less than or equal to B?

.EQ. Equal to A .EQ. B Is A equal to B?

.NE. Not equal to A .NE. B Is A not equal to B?

.GT. Greater than A .GT. B Is A greater than B?

.GE. Greater than or equal to A .GE. B Is A greater than or equal to B?

Note: The enclosing decimal points are required.