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Variable Scope and Global Variables (Variable Scope)

• You can have variables with the same name in different functions.
• The part within a program in which a variable is visible is known as the scope of the variable.
• The scope of a variable extends from its definition to the end of the block in which it was defined.
• Example:

  double future_value(double initial_balance, double p, int n)
  {
     double r = intial_balance * pow(1 + p / 100, n);
     return r;
  }
  
  int main()
  {
     cout << "Please enter the interest rate in percent: ";
     double r;
     cin >> r;
  
     double balance = future_value(10000, r, 10);
     cout << "After 10 years the balance is" << balance
        << "\n";
  
     return 0;
  }
  

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