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The different kinds of variables in a C++ program

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• Categories of variables in a C++ program
  • There are 3 (actually 2) kinds of variables in a C++ program (just like Java):

    Global variables (= class variables in Java) Local variables (= local variables in Java) Parameter variables (= parameter variables in Java)

    A parameter variables is actually a local variable defined at the start of the method/function, but it is initialized by the method/function invocation

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• How to recognize the kind of variables
  • The placement (location) of the variable inside the program determines the kind of the variable

  • Here is how to tell of the kind of a veriable

    int x; // Global variable: defined outside function int main(int argc, char *argv[] /* Parameter variables */) { int y; // Local variable: defined inside a function ... } double func(int x /* Parameter variables */) { int z; // Local variable: defined inside a function ... }