calc.c

#include <iostream>
using namespace std;
int main()
{
    string from, to, disp, v;
    int value;
    bool a = true;
    do {
      cout << "What would you like to convert from?" << endl << ">>";
      cin >> from;
    } while (from != "C" && from != "F" && from != "K");
    cout << "What would you like to convert to?" << endl << ">>";
    cin >> to;
    cout << "Calculator:" << endl << ">>";
    disp = to == "C" ? "Celsius" : to == "F" ? "Fahrenheit" : to == "K" ? "Kelvin" : "N/A";
    while (a) {
      cin >> v;
      if (from == "F") {
        value = (value - 32) / 1.8;
      }
      else if (from == "K") {
        value -= 273;
      }
      if (to == "F") {
        value = value * 1.8 + 32;
      }
      else if (to == "K") {
        value += 273;
      }
      cout << value << " degrees " << disp << endl << ">>";
    }
    a = true;
}