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.
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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
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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
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Example 4 .. Cont.
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