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  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4.  
  5.  
  6. long double getUserInput()
  7. {
  8.     cout << "Please enter a number: \n";
  9.     long double x;
  10.     cin >> x;
  11.     return x;
  12. }
  13.  
  14. char getMathematicalOperation()
  15. {
  16.     cout << "Please enter which operator you want (add +, subtract -, multiply *, or divide /): \n";
  17.     char o;
  18.     cin >> o;
  19.     return o;
  20. }
  21.  
  22. long double calculateResult(long double nX, char o, long double nY)
  23. {
  24. // note: we use the == operator to compare two values to see if they are equal
  25. // we need to use if statements here because there's no direct way to convert chOperation into the appropriate operator
  26.  
  27. if (o == '+') // if user chose addition
  28.     return nX + nY; // execute this line
  29. if (o == '-') // if user chose subtraction
  30.     return nX - nY; // execute this line
  31. if (o == '*') // if user chose multiplication
  32.     return nX * nY; // execute this line
  33. if (o == '/') // if user chose division
  34.     return nX / nY; // execute this line
  35. return -1; // default "error" value in case user passed in an invalid chOperation
  36. }
  37.  
  38. void printResult(long double x)
  39. {
  40.     cout << "The answer is: "  << setprecision(2) << x << "\n";
  41. }
  42.  
  43. long double calc()
  44. {
  45. // Get first number from user
  46.     long double nInput1 = getUserInput();
  47.  
  48. // Get mathematical operations from user
  49.     char o = getMathematicalOperation();
  50.  
  51. // Get second number from user
  52.     long double nInput2 = getUserInput();
  53.  
  54. // Calculate result and store in temporary variable (for readability/debug-ability)
  55.     long double nResult = calculateResult(nInput1, o, nInput2);
  56.  
  57. // Print result
  58.     printResult(nResult);
  59.     return 0;
  60. }
  61.  
  62.  
  63. int main()
  64. {
  65. 	calc();
  66. }
Success #stdin #stdout 0s 3232KB
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stdin
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100.1 / 1001
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Please enter a number: 
Please enter which operator you want (add +, subtract -, multiply *, or divide /): 
Please enter a number: 
The answer is: 0.1
https://ideone.com/MLSvKe
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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