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  1. /* 1 **************************************************
  2.  predefined code (header files, using directive)
  3.  ****************************************************/
  4. #include <iostream>     // cout, cin, and endl
  5. #include <string>       // string objects
  6. using namespace std;	// allows scope in std::<object>
  7.  
  8.  
  9. /* 2 **************************************************
  10.  structure definitions and global constants:
  11.  ****************************************************/
  12. const unsigned int  YEARS           = 3;    // years of data to collect
  13. const unsigned int  MONTHS          = 12;   // months per year
  14. const string        monthNames[12]  =       // array strings for month names
  15. {
  16.     "January",
  17.     "February",
  18.     "March",
  19.     "April",
  20.     "May",
  21.     "June",
  22.     "July",
  23.     "August",
  24.     "September",
  25.     "October",
  26.     "November",
  27.     "December"      };
  28.  
  29. /* 3 **************************************************
  30.  function prototypes:
  31.  ****************************************************/
  32. int             collectSalesData        (void);                                             // expects no arguments. returns int.
  33. int**           createBookSalesArray    (const unsigned int, const unsigned int);           // expects 2 const unsigned int. returns pointer-to-array-of-int.
  34. void            setBookSales            (int**, const unsigned int, const unsigned int);    // expects pointer-to-array-of-int. 2 const unsigned int. returns nothin.
  35. unsigned int    getTotalSales           (int**, const unsigned int, const unsigned int);    // expects pointer-to-array-of-int. 2 const unsigned int. returns unsigned int.
  36.  
  37. /* 4 *************************************************
  38.  main() code
  39.  ****************************************************/
  40. int main()	// required function returns int to OS.
  41. {
  42.  
  43.     /*  Create 2D Array	*/
  44.     int** monthlySalesPtr = createBookSalesArray(YEARS, MONTHS);
  45.  
  46.  
  47.     /*  Get Input From User. Pass Along Size of Arrays for overflow protection; YEARS, MONTHS	*/
  48.     setBookSales(monthlySalesPtr, YEARS, MONTHS);
  49.  
  50.  
  51.     /*  Stores Total # of Books Sold. Stores Returned Value From getTotalSales()	*/
  52.     unsigned int allBookSales = 0;
  53.     allBookSales = getTotalSales(monthlySalesPtr, YEARS, MONTHS);
  54.  
  55.  
  56.     /*  Reports Total Book Sales for # of YEARS	*/
  57.     cout << "Total annual sales: " << allBookSales << " books." << endl << endl;
  58.  
  59.  
  60.     system("pause");    // halts execution. keeps console in view.
  61.     return 0;           // indicates successful execution.
  62. }
  63.  
  64.  
  65. /* 5 **************************************************
  66.  new user-defined functions
  67.  ****************************************************/
  68. /*
  69.  *  Name:           createBookSalesArray()
  70.  *  Arguments:      pointer to array of data, number of years, number of months
  71.  *  Description:    Asks user for monthly book sales and stores them in 2D Array [which was created on the heap, from main()]
  72.  */
  73. int** createBookSalesArray(const unsigned int YRS, const unsigned int MNTHS)
  74. {
  75.     int** bookSalesArrayPtr = new int*[YRS];        // bookSalesArrayPtr is a Pointer to array of pointers, created on the heap (size of bookSalesArrayPtr is YEAR; 3)
  76.     for (unsigned int i = 0; i < YRS; i++)          // Intends to: Loop through each element of the array
  77.         bookSalesArrayPtr[i] = new int[MNTHS];      // and dynamically (heap) create an array of integers (size of int array is MONTHS; 12)
  78.     return bookSalesArrayPtr;	// Return to main(): a pointer-to-array-of-pointers [that will store the sales data]; multidimensional array.
  79. }
  80.  
  81.  
  82.  
  83. /*
  84.  *  Name:           setBookSales()
  85.  *  Arguments:      pointer to array of data, number of years, number of months
  86.  *  Description:    Asks user for monthly book sales and stores them in 2D Array [which was created on the heap, from main()]
  87.  */
  88. void setBookSales(int** salesDataPtr, const unsigned int YRS, const unsigned int MNTHS)
  89. {
  90.     /* Ask User for Monthly Values */
  91.     for (unsigned int row = 0; row < YRS; row++)        // Intends to: Loop through each 1st-Dimension element of the array [YRS]
  92.         for (unsigned int col = 0; col < MNTHS; col++)  // and each 2nd-Dimension element of the array [MNTHS]
  93.         {
  94.             cout << "Enter " << monthNames[col] << "'s sales numbers (for year " << (row + 1) << "): ";	// Ask For Sales, Each Month, By Year
  95.             cin >> salesDataPtr[row][col];              // Save the sales data by [YRS][MNTHS]
  96.         }
  97.  
  98.     return;	// Formal Return.
  99. }
  100.  
  101.  
  102.  
  103. /*  Name:           getTotalSales()
  104.  *  Arguments:      pointer to array of data, const number of years, const number of months
  105.  *  Description:    Sums book sales of all months, of all years. Returns total annual sales to main() for report to console.
  106.  */
  107. unsigned int getTotalSales(int** salesDataPtr, const unsigned int YRS, const unsigned int MNTHS)
  108. {
  109.     unsigned int totalAnnualSales = 0;                  // Holds sum of each month, for each year
  110.     for (unsigned int row = 0; row < YRS; row++)        // Intends to: Loop through each 1st-Dimension element of the array [YRS]
  111.         for (unsigned int col = 0; col < MNTHS; col++)  // and each 2nd-Dimension element of the array [MNTHS]
  112.         {
  113.             totalAnnualSales += salesDataPtr[row][col]; // Adds each months sales number to totalAnnualSales, thus summing all months, for each year.
  114.         }
  115.     return totalAnnualSales;	// Return total sales for all months, for all years.
  116.  
  117. }
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https://ideone.com/LcQeuj
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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