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  1. //Sam Partovi                      CS1A                        Ch. 9, P. 537, #2
  2. /*******************************************************************************
  3. * SORT AND CALCULATE AVERAGE OF TEST SCORES
  4. * ____________________________________________________________
  5. * This program dynamically allocates an array to store user-defined test 
  6. * scores. It validates input to ensure no negative scores, sorts the scores 
  7. * in ascending order, calculates the average, and displays the results.
  8. * ____________________________________________________________
  9. * INPUT
  10. * scores: Dynamically allocated array to store test scores
  11. * numScores: Number of test scores to be entered by the user
  12. * OUTPUT
  13. * sortedScores: Sorted list of scores in ascending order
  14. * average: The average of the entered test scores
  15. *******************************************************************************/
  16. #include <iostream>
  17. #include <iomanip>
  18. using namespace std;
  19.  
  20. //Function prototypes
  21. void sortScores(double* scores, int numScores);
  22. double calculateAverage(const double* scores, int numScores);
  23.  
  24. int main() {
  25.     int numScores; //INPUT - Number of test scores
  26.  
  27.    //Prompt user for the number of test scores
  28.     cout << "Enter the number of test scores: ";
  29.     cin >> numScores;
  30.  
  31.     //Validate input
  32.     while (numScores <= 0) {
  33.         cout << "Number of test scores must be positive. Try again: ";
  34.         cin >> numScores;
  35.     }
  36.  
  37.     //Dynamically allocate memory for the test scores
  38.     double* scores = new double[numScores];
  39.  
  40.     //Input test scores
  41.     for (int i = 0; i < numScores; i++) {
  42.         cout << "Enter score #" << (i + 1) << ": ";
  43.         cin >> *(scores + i);
  44.  
  45.         //Validate score input
  46.         while (*(scores + i) < 0) {
  47.             cout << "Scores cannot be negative. Re-enter score #" << 
  48.                     (i + 1) << ": ";
  49.             cin >> *(scores + i);
  50.         }
  51.     }
  52.     //Sort the scores in ascending order
  53.     sortScores(scores, numScores);
  54.  
  55.    //Calculate the average score
  56.     double average = calculateAverage(scores, numScores);
  57.  
  58.    //Display the sorted scores
  59.     cout << "\nSorted Scores:" << endl;
  60.     for (int i = 0; i < numScores; i++) {
  61.         cout << fixed << setprecision(2) << *(scores + i) << endl;
  62.     }
  63.  
  64.    //Display the average score
  65.     cout << "\nAverage Score: " << fixed << setprecision(2) << average << endl;
  66.  
  67.    //Free allocated memory
  68.     delete[] scores;
  69.  
  70.     return 0;
  71. }
  72.  
  73. //*****************************************************************************
  74. //Function definition for sortScores:                                         *
  75. //This function sorts an array of scores in ascending order using pointer     *
  76. //notation.                                                                   *
  77. //*****************************************************************************
  78. void sortScores(double* scores, int numScores) {
  79.     for (int i = 0; i < numScores - 1; i++) {
  80.         for (int j = i + 1; j < numScores; j++) {
  81.             if (*(scores + i) > *(scores + j)) {
  82.                 double temp = *(scores + i);
  83.                 *(scores + i) = *(scores + j);
  84.                 *(scores + j) = temp;
  85.             }
  86.         }
  87.     }
  88. }
  89.  
  90. //*****************************************************************************
  91. //Function definition for calculateAverage:                                   *
  92. //This function calculates the average of the scores in an array using        *
  93. //pointer notation.                                                           *
  94. //*****************************************************************************
  95. double calculateAverage(const double* scores, int numScores) {
  96.     double total = 0.0;
  97.     for (int i = 0; i < numScores; i++) {
  98.         total += *(scores + i);
  99.     }
  100.     return total / numScores;
  101. }
  102.  
Success #stdin #stdout 0s 5284KB
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stdin
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4
80.20
85.85
45.87
95.36
stdout
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Enter the number of test scores: Enter score #1: Enter score #2: Enter score #3: Enter score #4: 
Sorted Scores:
45.87
80.20
85.85
95.36

Average Score: 76.82
https://ideone.com/gIT5mX
chapter 9 (#2)
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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