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  1. //Sam Partovi                      CS1A                   Chapter 4, P. 223, #17
  2. //
  3. /*******************************************************************************
  4. *
  5. * CATEGORIZE ELECTROMAGNETIC WAVELENGTH
  6. * ____________________________________________________________
  7. * This program categorizes a given wavelength of electromagnetic waves and 
  8. * determines the type of electromagnetic radiation that is present at the 
  9. * specified wavelengths.
  10. *
  11. * The analysis is based on the following table (reported in meters):
  12. * 1E-2 and larger = Radio wave           1E-2 to 1E-3 = Microwave
  13. * 1E-3 to 7E-7 = Infrared wave           7E-7 to 4E-7 = Visible light
  14. * 4E-7 to 1E-8 = Ultraviolet             1E-8 to 1E-11 = X ray                     
  15. * 1E-11 and smaller = Gamma ray
  16. * ____________________________________________________________
  17. * INPUT
  18. * wavelength : Given wavelength in meters
  19. * 
  20. * OUTPUT
  21. * Category of electromagnetic radiation
  22. *
  23. ******************************************************************************/
  24. #include <iostream>
  25. #include <iomanip>
  26.  
  27. using namespace std;
  28. int main ()
  29. {
  30.  float wavelength;      //Given wavelength in meters
  31.  
  32. //Prompt user for wavelength input
  33.  cout << "Enter the wavelength of an electromagnetic wave in meters.\n";
  34.  cout << "Input can be expressed as a decimal value (e.g. 0.0001) or as " 
  35.          "scientific notation (e.g. 1E-5)\n";
  36.  cout << "------------------------------------------------------\n";
  37.  cout << "Wavelength (m): ";
  38.  cin >> wavelength;
  39.  
  40. //Determine the type of electromagnetic radiation
  41.  
  42. //Analyze if radio waves present
  43.  if (wavelength <= 1E-11) {
  44.   cout << "\nAt a wavelength of " << wavelength << 
  45.           " meters, gamma rays are present.\n";
  46.  }
  47.  
  48. //Analyze if microwave radiation is present
  49.  else if (wavelength < 1E-8) {
  50.   cout << "\nAt a wavelength of " << wavelength << 
  51.           " meters, X rays are present.\n";
  52.  }
  53.  
  54. //Analyze if infrared radiation is present
  55.  else if (wavelength < 4E-7) {
  56.   cout << "\nAt a wavelength of " << wavelength << 
  57.           " meters, ultraviolet radiation is present.\n";
  58.  }
  59.  
  60. //Analyze if visible light is present
  61.  else if (wavelength < 7E-7) {
  62.    cout << "\nAt a wavelength of " << wavelength << 
  63.            " meters, visible light is present.\n";
  64.   }
  65.  
  66. //Analyze if ultraviolet radiation is present
  67.  else if (wavelength < 1E-3) {
  68.    cout << "\nAt a wavelength of " << wavelength << 
  69.            " meters, infrared radiation is present.\n";
  70.   }
  71.  
  72. //Analyze if X rays are present
  73.  else if (wavelength < 1E-2) {
  74.    cout << "\nAt a wavelength of " << wavelength << 
  75.            " meters, microwave radiation is present.\n";
  76.   }
  77.  
  78. //Analyze if gamma rays are present
  79.  else if (wavelength >= 1E-2) {
  80.    cout << "\nAt a wavelength of " << wavelength << 
  81.            " meters, radio waves are present.\n";
  82.   }
  83.  
  84. //Input validation: Display error if wavelength less than or equal to 0
  85.  else if (wavelength <= 0) {
  86.   cout << "\nError! Your wavelength value must be greater than 0 meters.\n";
  87.  }
  88.  
  89.  return 0;
  90. }
  91.  
  92.  
Success #stdin #stdout 0.01s 5272KB
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1e-8
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Enter the wavelength of an electromagnetic wave in meters.
Input can be expressed as a decimal value (e.g. 0.0001) or as scientific notation (e.g. 1E-5)
------------------------------------------------------
Wavelength (m): 
At a wavelength of 1e-08 meters, X rays are present.
https://ideone.com/b6oo2E
chapter 4 (spectral analysis)
language:
C++ (gcc 8.3)
created:
1 hour ago
visibility:
public

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