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Published on March 9, 2014

Author: fyjordan9

Source: slideshare.net

Basic Scientific Programming Case Statement

The Case Construct  Used in cases where exactly one of several alternative actions is selected and performed. form Select Case(Selector) case(label-list1) statement sequence1 case(label-list2) statement sequence2 “ case(label-list n) statement sequence n End select

  Selector is an integer, character, or logical expression. The values in the list may have any of the forms: (value) single value (value1: value2) range of values from value1 through value2. (value1:) range of values greater than or equal to value1 (: value2) range of values less than or equal to value2

Example  Select Case(Class_Code) Case(1) print*,’Freshman’ Case(2) print*,’Sophomore’ Case(3) print*,’Junior’ Case(4) print*,’Senior’ Case Default print*, ‚error,Illegal code‛ End Select

Example: Pollution Index   A case statement can be used to carry out the classification given (good, fair, or poor). A case statement can be used to replace an IF / ELSE IF structure.

Range Selectors “Integers”  Select Case(Int(average)) case(90:) grade = ‚A‛ case(80:89) grade = ‚B‛ case(70:79) grade = ‚C‛ case(60:69) grade = ‚D‛ case(:59) grade = ‚F‛ End Select

Range Selectors “Characters”  Select Case(char) case(‘A’: ‘Z’) Print*, ‘uppercase’ case(‘a’: ’z’) Print*, ‘lowercase’ case(‘0’:’9’) Print*, ‘numbers’ case default Print*, ‘Not a letter or number’ End Select

What about real valued selectors??   A selector can’t be of type real. To make a selection, convert the real number to an integer and then use it for the selection.

example Suppose a motors’ RPM is determined by an indicator x.  high speed x>= 5.5  normal speed 2.5<= x < 5.5  Low speed x < 2.5 Select Case(int(10*x)) case(55:) print*, ‚HIGH SPEED‛ case(25:54) print*, ‚NORMAL SPEED‛ case(:24) print*, ‚LOW SPEED‛ End Select

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