Variable names are alphanumeric but must start with a letter. The length of a variable name is limited to thirty-two characters for non-SAS data set variables Model variables are declared by VAR, ...

Abstract: As basic elements in program, variables convey essential information that is critical for program comprehension and maintenance. However, understanding the meanings of variables in program ...

Abstract: Constructing program invariants is one of the key problems of program verification. A lot of approaches to invariant generation have been reported, and all of these methods assume that ...