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  1. //Sam Partovi                      CS1A                   Chapter 4, P. 221, #10
  2. //
  3. /*******************************************************************************
  4. *
  5. * COMPUTE QUANTITY-BASED DISCOUNT
  6. * ____________________________________________________________
  7. * This program computes discount percentage and total cost based on a given
  8. * item quantity, with varying discounts for multiple quantity ranges.
  9. * 
  10. * Discounts are determined by the following table:
  11. *      0 - 9 units = 0% discount            10 - 19 units = 20% discount
  12. *      20 - 49 units = 30% discount         50 - 99 units = 40% discount
  13. *      100+ units = 50% discount
  14. * 
  15. * The total purchase price is calculated with the following formula:
  16. * totalCost = (unitsSold*itemPrice) - (unitsSold * itemPrice * discountDecimal)
  17. * 
  18. * The total savings are calulated with the following formula:
  19. * totalSavings = (unitsSold * itemPrice * discountDecimal)
  20. * ____________________________________________________________
  21. * INPUT
  22. * unitsSold : Quantity of units to be sold
  23. * discountDecimal : Discount expressed as a decimal
  24. * itemPrice : Price per item
  25. *
  26. * OUTPUT
  27. * discountPercentage : Discount expressed as a percentage
  28. * totalCost : Total purchase price after realizing discount
  29. * totalSavings : Total savings after realizing discount
  30. * 
  31. ******************************************************************************/
  32. #include <iostream>
  33. #include <iomanip>
  34. using namespace std;
  35. int main ()
  36. {
  37.  
  38.  int unitsSold;              //INPUT - Quantity of units to be sold
  39.  float discountDecimal;     //INPUT - Discount expressed as a decimal
  40.  float discountPercentage; //OUTPUT - Discount expressed as a percentage
  41.  float totalCost;       //OUTPUT - Total purchase price after realizing discount
  42.  float totalSavings;   //OUTPUT - Total savings after realizing discount
  43.  
  44. //
  45. //Initialize program variables
  46.  const float itemPrice = 99.00;
  47.  discountDecimal = 0.00;    //Before receiving user input, discount is 0%.
  48.  
  49. //
  50. //Prompt user to input unitsSold
  51.  cout << "Enter the quantity of software packages to purchase: \n";
  52.  cin >> unitsSold;
  53.  
  54. //
  55. //Compute discount, savings, and total for 0-9 units
  56. if (unitsSold > 0 and unitsSold < 10) {
  57.  totalCost = (unitsSold*itemPrice) - (unitsSold * itemPrice * discountDecimal);
  58.  totalSavings = (unitsSold * itemPrice * discountDecimal);
  59.  
  60.  cout << "Your purchase of " << unitsSold << 
  61.          " unit(s) does not qualify for a discount.\n";
  62.  cout << "Your total is $" << fixed << setprecision(2) << totalCost << ".\n";
  63. }
  64.  
  65. //
  66. //Compute discount, savings, and total for 10-19 units
  67. else if (unitsSold >= 10 and unitsSold <= 19) {
  68.  discountDecimal += 0.20;
  69.  discountPercentage = discountDecimal * 100;
  70.  totalCost = (unitsSold*itemPrice) - (unitsSold * itemPrice * discountDecimal);
  71.  totalSavings = (unitsSold * itemPrice * discountDecimal);
  72.  
  73.  cout << "You are receiving a " << discountPercentage << "% discount, saving $"
  74.       << fixed << setprecision(2) << totalSavings << ".\n";
  75.  cout << "Your total is $" << fixed << setprecision(2) << totalCost << ".";
  76.  
  77. }
  78.  
  79. //
  80. //Compute discount, savings, and total for 20-49 units
  81. else if (unitsSold > 19 and unitsSold <= 49) {
  82.  discountDecimal += 0.30;
  83.  discountPercentage = discountDecimal * 100;
  84.  totalCost = (unitsSold*itemPrice) - (unitsSold * itemPrice * discountDecimal);
  85.  totalSavings = (unitsSold * itemPrice * discountDecimal);
  86.  
  87.  
  88.  cout << "You are receiving a " << discountPercentage << "% discount, saving $" 
  89.       << fixed << setprecision(2) << totalSavings << ".\n";
  90.  cout << "Your total is $" << fixed << setprecision(2) << totalCost << ".";
  91.  
  92. }
  93.  
  94. //
  95. //Compute discount, savings, and total for 49-99 units
  96. else if (unitsSold > 49 and unitsSold <= 99) {
  97.  discountDecimal += 0.40;
  98.  discountPercentage = discountDecimal * 100;
  99.  totalCost = (unitsSold*itemPrice) - (unitsSold * itemPrice * discountDecimal);
  100.  totalSavings = (unitsSold * itemPrice * discountDecimal);
  101.  
  102.  
  103.  cout << "You are receiving a " << discountPercentage << "% discount, saving $" 
  104.       << fixed << setprecision(2) << totalSavings << ".\n";
  105.  cout << "Your total is $" << fixed << setprecision(2) << totalCost << ".";
  106.  
  107. }
  108.  
  109. //
  110. //Compute discount, savings, and total for 99+ units
  111. else if (unitsSold > 99) {
  112.  discountDecimal += 0.50;
  113.  discountPercentage = discountDecimal * 100;
  114.  totalCost = (unitsSold*itemPrice) - (unitsSold * itemPrice * discountDecimal);
  115.  totalSavings = (unitsSold * itemPrice * discountDecimal);
  116.  
  117.  
  118.  cout << "You are receiving a " << discountPercentage << "% discount, saving $"
  119. 	  << fixed << setprecision(2) << totalSavings << ".\n";
  120.  cout << "Your total is $" << fixed << setprecision(2) << totalCost << ".";
  121.  
  122. }
  123.  
  124. //
  125. //Input validation: Display error if quantity < 0
  126. else if (unitsSold <= 0) {
  127.  cout << "\nError! Your purchase must be greater than 0 units.";
  128. }
  129.  
  130.  return 0;
  131. }
  132.  
  133.  
Success #stdin #stdout 0.01s 5272KB
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stdout
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Enter the quantity of software packages to purchase: 
You are receiving a 20% discount, saving $237.60.
Your total is $950.40.
https://ideone.com/lp6GkN
chapter 4 (discount)
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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