Microsoft KB Archive/123662

= BUG: Select Case Does Not Allow Character Expression String =

Article ID: 123662

Article Last Modified on 10/17/2003

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APPLIES TO


 * Microsoft FORTRAN PowerStation 1.0 Standard Edition
 * Microsoft Fortran PowerStation 1.0a for MS-DOS
 * Microsoft FORTRAN PowerStation 32

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This article was previously published under Q123662



SYMPTOMS
Compiling a program that contains a SELECT CASE statement that uses a variable in a character substring of length 1, fails and gives the following error message:

F2868: SELECT CASE : character expression must be of length 1



CAUSE
The compiler incorrectly evaluates the length of a character substring, when the character substring is defined using a variable, not a constant.



RESOLUTION
Avoid a SELECT statement that uses a character substring defined with a variable. Instead, use a character substring defined with a constant. As an alternative, you can define a temporary character variable of length 1 and assign the substring to that variable, which can be later used with a SELECT statement.



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.



Sample Code to Reproduce Problem
C Compile options needed: none C The following program reproduces the problem:

program go     character*5 a      integer*4 len a = "Hello" len = 1 select case( a(len:len) ) ! offending statement case default end select end

Sample Code to Solve Problem
C Compile options needed: none C The following code solves the problem:

program go     character*5 a      a = "Hello" select case( a(1:1) ) case default end select end

Sample Code to Solve Problem
C Compile options needed: none C The following code solves the problem:

program go     character a*5,tmp*1 integer*4 len a = "Hello" len = 1 tmp=a(len:len) select case( tmp ) case default end select end

Additional query words: 1.00 1.00a

Keywords: KB123662

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