C++ Primer 7.2

7.2.cpp

#include <iostream>

void inputScore(int * score_card, int score_size);
void displayScore(int * score_card, int score_size);
double getAverageScore(int * score_card, int score_size);

int main()
{
  using namespace std;
  cout.setf(ios_base::fixed, ios_base::floatfield);

  const int SCORE_SIZE = 10;
  int score_card[SCORE_SIZE];

  // init
  int i = 0;
  for (; i < SCORE_SIZE; i++) { score_card[i] = 0; }

  // input score
  inputScore(score_card, SCORE_SIZE);

  // display score
  displayScore(score_card, SCORE_SIZE);

  // calculate average score
  double average = getAverageScore(score_card, SCORE_SIZE);

  // display average score
  cout << "average: " << average << endl;

  // output
  return 0;
}

void inputScore(int * score_card, int score_size)
{
  using namespace std;

  int i = 0;
  for (; i < score_size; i++) {
    cout << "Please enter #" << (i + 1) << " golf score (enter 0 to stop): ";

    int score;
    cin >> score;
    if (0 == score) { break; }
    score_card[i] = score;
  }
}

void displayScore(int * score_card, int score_size)
{
  using namespace std;

  int i = 0;
  for (; i < score_size; i++) {
    if (0 == score_card[i]) { return; }
    cout << i << ": " << score_card[i] << endl;
  }
}

double getAverageScore(int * score_card, int score_size)
{
  double sum = 0;
  int i = 0;
  for (; i < score_size; i++) {
    if (0 == score_card[i]) { break; }
    sum += score_card[i];
  }
  return sum / i;
}