celsius to kelvin and fahrenheit

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 5 Exercise 6
Using std_lib_facilities.h by Bjarne Stroustrup.

[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PP
// Chapter 5 Exercise 6

//input: 24

#include "std_lib_facilities.h"

double ctoftok(double c) {

//celsius to fahrenheit to kelvin

double lowestTempinC = -273.15;
double highestTempinC = 57.8;
double kelvin = 273.15;

if (lowestTempinC >= c) {
error("Temperature is unrealisticly low: ", c);
}
if (highestTempinC <= c) {
error("Temperature is unrealisticly high: ", c);
}

double f = 9.0 / 5 * c + 32;
double k = c + kelvin;

cout << "celsius: " << c << ", fahrenheit: " << f << ", kelvin: " << k << "\n";
return 0;
}

int main()
try
{
double value = 0;
string s;

cout << "Enter temperature in celsius degree to get fahrenheit and kelvin: \n";

if (cin >> value) {
ctoftok(value);
}

else {
cin.clear();
cin >> s;
error("Illegal input entered: ", s);
}

keep_window_open();
}

catch (runtime_error e) {
cout << e.what() << "\n";
keep_window_open(".");
}
catch (…) {
cout << "Exiting \n";
keep_window_open(".");
}
[/code]

Output:
Enter temperature in celsius degree to get fahrenheit and kelvin:
24
celsius: 24, fahrenheit: 75.2, kelvin: 297.15