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1. Local variables cannot be used by other forms.
2. Cannot be used globally.
3. They can slowdown the compiling process.
Wiki User
∙ 10y ago
Wiki User
∙ 14y agoA local variable only has meaning within the function block it was declared in. This means that you don't have to have a separate variable name for each local variable in your program, and you can guarantee that they will not be modified outside of the function they are in.
Wiki User
∙ 9y agoLocal variables are scoped to the locality in which they are declared. That is, they are not accessible outwith that scope because they do not physically exist until that scope becomes active. Thus when invoking a function, its local variables are instantiated. When the function returns to its caller, the local variables fall from scope and are destroyed. Similarly with non-static class members; the members are instantiated when an object of the class is instantiated and destroyed when the object falls from scope.
Wiki User
∙ 12y agoThe only disadvantage of a global variable is that you cannot directly encapsulate them. Other than that, there is no real disadvantage of global variables.
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