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  1. // Elaine Torrez                          CS1A                         Chapter 6, P.369, #2
  2. // *****************************************************************************************
  3. // *                                    RECTANGLE AREA                                      *
  4. // *--------------------------------------------------------------------------------------- *
  5. // * This program asks the user to enter the length and width of a rectangle, then          *
  6. // * calculates and displays the rectangle’s area.                                          *
  7. // * The program uses separate functions to get the input values, calculate the area,       *
  8. // * and display the results.                                                               *
  9. // *--------------------------------------------------------------------------------------- *
  10. // * INPUT                                                                                  *
  11. // *   length : Length of the rectangle (must be positive)                                  *
  12. // *   width  : Width of the rectangle (must be positive)                                   *
  13. // *--------------------------------------------------------------------------------------- *
  14. // * OUTPUT                                                                                 *
  15. // *   area   : The calculated area of the rectangle                                        *
  16. // *****************************************************************************************
  17.  
  18. #include <iostream>
  19. #include <iomanip>
  20. #include <limits>     // for input validation
  21. using namespace std;
  22.  
  23. // ---------------- Function Prototypes ----------------
  24. double getLength();
  25. double getWidth();
  26. double getArea(double length, double width);
  27. void displayData(double length, double width, double area);
  28.  
  29. // ---------------------- MAIN -------------------------
  30. int main()
  31. {
  32.     double length, width, area;
  33.  
  34.     // Get length and width using input functions
  35.     length = getLength();
  36.     width  = getWidth();
  37.  
  38.     // Calculate the area
  39.     area = getArea(length, width);
  40.  
  41.     // Display results
  42.     displayData(length, width, area);
  43.  
  44.     return 0;
  45. }
  46.  
  47. // ---------------- Function Definitions ----------------
  48.  
  49. // Function to get the rectangle's length
  50. double getLength()
  51. {
  52.     double length;
  53.     cout << "Enter the rectangle's length: ";
  54.     cin >> length;
  55.  
  56.     // Validate input
  57.     while (cin.fail() || length <= 0.0)
  58.     {
  59.         cin.clear();
  60.         cin.ignore(numeric_limits<streamsize>::max(), '\n');
  61.         cout << "ERROR: Length must be positive. Re-enter: ";
  62.         cin >> length;
  63.     }
  64.  
  65.     return length;
  66. }
  67.  
  68. // Function to get the rectangle's width
  69. double getWidth()
  70. {
  71.     double width;
  72.     cout << "Enter the rectangle's width: ";
  73.     cin >> width;
  74.  
  75.     // Validate input
  76.     while (cin.fail() || width <= 0.0)
  77.     {
  78.         cin.clear();
  79.         cin.ignore(numeric_limits<streamsize>::max(), '\n');
  80.         cout << "ERROR: Width must be positive. Re-enter: ";
  81.         cin >> width;
  82.     }
  83.  
  84.     return width;
  85. }
  86.  
  87. // Function to calculate the rectangle's area
  88. double getArea(double length, double width)
  89. {
  90.     return length * width;
  91. }
  92.  
  93. // Function to display the results
  94. void displayData(double length, double width, double area)
  95. {
  96.     cout << fixed << setprecision(2);
  97.     cout << "\nLength : " << length << endl;
  98.     cout << "Width  : " << width << endl;
  99.     cout << "Area   : " << area << endl;
  100. }
  101.  
Success #stdin #stdout 0.01s 5292KB
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stdin
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5
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stdout
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Enter the rectangle's length: Enter the rectangle's width: 
Length : 5.00
Width  : 3.00
Area   : 15.00
https://ideone.com/uTXe6o
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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