University of Central Florida (UCF) EGN3211 Engineering Analysis and Computation Final Practice Exam

When a variable is declared in a certain scope, it means that it exists within that specific part of the program, and its name is associated with a particular type and value. If the variable 'xyz' is re-declared in the same scope, the language's rules regarding variable declarations come into play.

In most programming languages, including C, two local variables cannot have the same name within the same scope. This is to prevent ambiguity during the linking and execution phases of the program, as it would be unclear which variable is being referred to when the name 'xyz' is used. As a result, attempting to re-declare a variable with the same name in the same scope raises a compile-time error. This ensures that the code is clear and prevents any possible conflicts or confusion that could arise due to duplicate variable names.

In summary, when a variable is re-declared in the same scope, the program will generate a compile error, indicating that it cannot have two local variables with the same name. This reinforces the principles of scope and variable management in programming.