Function Interface Examples
void PrintAverage( /* in */ float sum,
                   /* in */ int count)
// Precondition:
//    sum is assigned && count > 0
// Postcondition:
//    The average sum/count has been output on one line
void Calc( /* in */  int alpha,
           /* inout */ int& beta )
// Precondition:
//    alpha and beta are assigned
// Postcondition:
//    beta == beta@entry * 7 - alpha