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TWEET # Untitled a guest Oct 21st, 2019 75 Never
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1.
2. #include<iostream>
3.
4. using namespace std;
5.
6. double ToCelsius(double farhrenheit);
7. double ToKelvin(double fahrenheit);
8.
9. int main()
10. {
11.     // Prompt the user and get their input.
12.     cout << "Enter a temperature in Fahrenheit and it will be converted into Celsius and Kelvin." << endl;
13.
14.     // TODO: Change this to an int to follow the specification to the T.
15.     // It doesn't really make sense to only allow whole numbers to be entered,
16.     // but whatever.
17.     double fahrenheit = 0.0;
18.     cin >> fahrenheit;
19.
20.     // Call into our functions to perform the calculations.
21.     double celsius = ToCelsius(fahrenheit);
22.     double kelvin = ToKelvin(fahrenheit);
23.
24.     // Print the results.
25.     cout << fahrenheit << " is " << celsius << " in Celsius." << endl;
26.     cout << fahrenheit << " is " << kelvin << " in Kelvin." << endl;
27.     system("pause");
28.
29.     return 0;
30. }
31.
32. double ToCelsius(double fahrenheit)
33. {
34.     // Hi, my name is *ms narrator voice starts* Paul Pham *ms narrator voice ends* and this is a micro-optimization.
35.     // Division takes longer to perform than multiplication, so we'll only do the division one time
36.     // then just use that calculated value.
37.
38.     const double FIVE_OVER_NINE = 5.0 / 9.0;
39.     return (fahrenheit - 32) * FIVE_OVER_NINE;
40.
41.     // Use this one to remove the constant double...
42.     // return (fahrenheit - 32) * (5.0 / 9.0);
43. }
44.
45. double ToKelvin(double fahrenheit)
46. {
47.     // It'll save us some typing - and reduce code duplication - to convert to celsius first.
48.     // We could just accept the celsius as an input parameter, but that would be inconsistent
49.     // with our ToCelsius function.