140: Highlights

• A local variable is a variable that is declared inside a function definition. A global variable is a variable that is defined outside of any function definition.
• C++ isolates parameters and local variables, enabling you to reuse their names. Accordingly, the values of a function's parameters and local variables are not available after that function has returned. Also, when one function calls another, the values of the parameters and local variables in the calling function are not available during the execution of the called function.
• You can obtain a value for a global variable everywhere, except in functions in which there is a parameter or local variable that happens to have the same name. You can assign a value to a global variable anywhere that you can obtain a value for that variable.
• You can obtain a value for a global constant everywhere, except in functions in which there is a parameter or local variable that happens to have the same name, but you cannot reassign global constants anywhere.