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#include <iostream>
using namespace std;
/*
1. F to C
> What is the input temperature? 32
> What are the units of the input temperature (C for Celcius or F for Fahrenheit)? F
> Your input temperature is 32F which is 0C.
2. C to F
> What is the input temperature? 100
> What are the units of the input temperature (C for Celcius or F for Fahrenheit)? C
> Your input temperature is 100C which is 212F.
3. Out of range C
> What is the input temperature? -274
> What are the units of the input temperature (C for Celcius or F for Fahrenheit)? C
> Your input temperature is -274C which is out of range (less than -273.15C or -416F)
4. Out of range F
> What is the input temperature? -417
> What are the units of the input temperature (C for Celcius or F for Fahrenheit)? F
> Your input temperature is -417 which is out of range (less than -273.15C or -416F)
5. Unknown unit
> What is the input temperature? -40
> What are the units of the input temperature (C for Celcius or F for Fahrenheit)? Q
> The units you have specified are not one of C (Celcius) or F (Fahrenheit).
*/
int main(void) {
char input_units, output_units;
float input_temp, output_temp;
int error = 0;
cout << "What is the input temperature? ";
cin >> input_temp;
cout << "What are the units of the input temperature (C for Celcius or F for "
"Fahrenheit)? ";
cin >> input_units;
input_units = toupper(input_units);
if (input_units == 'C') {
cout << "Your input temperature is " << input_temp << input_units;
if (input_temp < -273) {
cout << " which is out of range (less than -273C or -416F)." << endl;
} else {
// output_units = 'F';
output_temp = (input_temp * (9.0 / 5.0)) + 32.0;
cout << " which is " << output_temp << "F" << "." << endl;
}
} else if (input_units == 'F') {
cout << "Your input temperature is " << input_temp << input_units;
if (input_temp < -416) {
cout << " which is out of range (less than -273C or -416F)." << endl;
} else {
// output_units = 'C';
output_temp = (((input_temp - 32.0) * 5.0) / 9.0);
cout << " which is " << output_temp << "C" << "." << endl;
}
} else {
cout << "The units you have specified are not one of C (Celcius) or F "
"(Fahrenheit)"
<< endl;
}
return 0;
}
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