Sequence, Selection, Iteration The IF Statement

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Presentation transcript:

Sequence, Selection, Iteration The IF Statement COBOL Sequence, Selection, Iteration The IF Statement

IF Statement Simplified basic syntax: IF condition statement What is a condition? An expression formed using relational or logical operators

Relational Operators = equal to > greater than < less than NOT = not equal to NOT > not greater than NOT < not less than >= greater than or equal to <= less than or equal to

Logical Operators AND OR Compound Conditions – conditional expressions formed by usage of one or more logical operators, for example, IF A < 100 AND B > 20 . . . IF A = 0 OR B = 0 . . . IF A > 0 AND B > 0 OR C < 0 . . .

Precedence for Evaluation of Logical Expressions HIGH simple condition (relational expression) complex condition in parentheses NOT AND LOW OR Consider: NOT (NOT A < 10 AND B = 4) {if A=6, B=6}

Precedence for Evaluation of Logical Expressions HIGH simple condition complex condition in parentheses NOT AND LOW OR Consider: NOT (NOT A < 10 AND B = 4) {if A=6, B=6} T F

Precedence for Evaluation of Logical Expressions HIGH simple condition complex condition in parentheses NOT AND LOW OR Consider: NOT (NOT A < 10 AND B = 4) {if A=6, B=6} T F ---------------- false

Precedence for Evaluation of Logical Expressions HIGH simple condition complex condition in parentheses NOT AND LOW OR Consider: NOT (NOT A < 10 AND B = 4) {if A=6, B=6} T F ---------------- false -----------------------------------

Precedence for Evaluation of Logical Expressions HIGH simple condition complex condition in parentheses NOT AND LOW OR Consider: NOT (NOT A < 10 AND B = 4) {if A=6, B=6} T F ---------------- false ----------------------------------- ------------------------------------------------- true

Logical Expressions (Conditions) Can appear in clauses other than IF statement. PERFORM …UNTIL EVALUATE other . . .

IF with ELSE Simplified basic syntax: IF condition statement(s) ELSE statement(s) END-IF