2. Embedded QUEL for C : C Variables and Data Types : Variable and Type Declarations : EQUEL Variable Declaration Procedures
 
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EQUEL Variable Declaration Procedures
You must make known to the processor any C language variable that you use in an EQUEL statement so that it can determine the type of the variable. You must precede the variable declaration in an EQUEL/C program by two number signs (##) that begin in the first column position of the line. If a variable is not used in an EQUEL statement, you do not need to use number signs.