9.Selection(B)

# 9.Selection(B) - Multi Way Selection You can choose...

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Multi Way Selection You can choose statement(s) to run from many sets of choices. There are two cases for this: (a) Multi way selection by nested IF structure (b) Multi way selection by SWITCH structure

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Multi Way Selection by Nested IF Structure The structure that contains another structure of the same type is called a nested structure. In the Nested IF structure, the statements that exists between IF and ELSE or between IF and END IF can contain IF statement.
Multi Way Selection by Nested If Structure .. Cont. Syntax of one possible structure: IF ( condition1 ) THEN Statements1 ELSE IF ( condition2 ) THEN Statements2 ELSE IF ( Condition3 ) THEN Statements3 ELSE IF ( Condition4 ) THEN Statements4 END IF END IF END IF Note: The nest can be to many levels. The following figure shows the execution of this structure.

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Multi Way Selection by Nested If Structure .. Cont. Condition1 Condition2 Statements2 Statements3 Rest of algorithm Statements1 Condition3 Statements4 True True True False False False
Multi Way Selection by Nested If Structure .. Examples Example 4: Write an algorithm that inputs a student mark and outputs the corresponding grade, where grades are as follows: mark grade 90-100 A 80-89 B 70-79 C 60-69 D < 60 E

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Example 4 .. Cont. 1- Analysis stage : Problem Input: - student’s mark, mark Problem Output: - grade Criteria - according to the previous grade table
Example 4 .. Cont.

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