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Return Values

• When the return statement is processed, the function exits immediately.

  double future_value(double initial_balance, double p, int n)
  {
     if (n < 0) return 0;
     if (p < 0) return 0;
     double b = initial_balance * pow(1 + p / 100, n);
     return b;
  }
  

• It is important that every branch of a function return a value.

  double future_value(double initial_balance, double p, int n)
  {
     if (p >= 0) 
        return = initial_balance * pow(1 + p / 100, n);
     /* Error */
  }
  

• Functions that returns a truth value is called a predicate.

  bool approx_equal(double x, double y)
  {
     const double EPSILON = 1E-14;
     if (x == 0) return fabs(y) <= EPSILON;
     if (y == 0) return fabs(x) <= EPSILON;
     return fabs(x - y) / max(fabs(x), fabs(y)) <= EPSILON;
  }
  

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