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  1. //Devin Scheu                                  CS1A                                    Chapter 4, P. 220, #2
  2. //
  3. /**************************************************************
  4. *
  5. * CONVERT NUMBER TO ROMAN NUMERAL
  6. * ____________________________________________________________
  7. * This program asks for a number between 1 and 10
  8. * and displays its Roman numeral equivalent.
  9. *
  10. * Computation is based on a switch statement mapping numbers to
  11. * Roman numerals: 1=I, 2=II, 3=III, 4=IV, 5=V, 6=VI, 7=VII,
  12. * 8=VIII, 9=IX, 10=X
  13. * ____________________________________________________________
  14. * INPUT
  15. * number : The number to convert (as an integer)
  16. *
  17. * OUTPUT
  18. * romanNumeral : The Roman numeral equivalent of the input number
  19. *
  20. **************************************************************/
  21.  
  22. #include <iostream>
  23. #include <iomanip>
  24.  
  25. using namespace std;
  26.  
  27. int main () {
  28.  
  29. 	//Variable Declarations
  30. 	int number;         //INPUT      - The number to convert (as an integer)
  31. 	string romanNumeral; //OUTPUT     - The Roman numeral equivalent of the input number
  32.  
  33. 	//Prompt for Input
  34. 	cout << "Enter a number between 1 and 10: ";
  35. 	cin >> number;
  36.  
  37. 	//Input Validation and Conversion
  38. 	if (number < 1 || number > 10) {
  39. 		romanNumeral = "Invalid input";
  40. 	} else {
  41. 		switch (number) {
  42. 			case 1:
  43. 				romanNumeral = "I";
  44. 				break;
  45. 			case 2:
  46. 				romanNumeral = "II";
  47. 				break;
  48. 			case 3:
  49. 				romanNumeral = "III";
  50. 				break;
  51. 			case 4:
  52. 				romanNumeral = "IV";
  53. 				break;
  54. 			case 5:
  55. 				romanNumeral = "V";
  56. 				break;
  57. 			case 6:
  58. 				romanNumeral = "VI";
  59. 				break;
  60. 			case 7:
  61. 				romanNumeral = "VII";
  62. 				break;
  63. 			case 8:
  64. 				romanNumeral = "VIII";
  65. 				break;
  66. 			case 9:
  67. 				romanNumeral = "IX";
  68. 				break;
  69. 			case 10:
  70. 				romanNumeral = "X";
  71. 				break;
  72. 		}
  73. 	}
  74.  
  75. 	//Output Result
  76. 	cout << "\n";
  77. 	cout << left << setw(25) << "Entered Number:" << right << setw(15) << number << endl;
  78. 	cout << left << setw(25) << "Roman Numeral:" << right << setw(15) << romanNumeral << endl;
  79.  
  80. } //end of main()
Success #stdin #stdout 0.01s 5308KB
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stdin
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Standard input is empty
stdout
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Enter a number between 1 and 10: 
Entered Number:                        0
Roman Numeral:             Invalid input
https://ideone.com/XISH96
language:
C++ (gcc 8.3)
created:
17 hours ago
visibility:
public

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