Temperature Converter (From my early college days!)

temperature.cpp

/*  Delio Castillo
    BIS 221 C++
    Charles Godfrey, Instructor
    Spring 2002

    Project Name : Project03A


    Purpose of Program
        To convert temperatures from Celsius to 
        Farenheit and viceversa.

    Inputs:
        "C" to convert from Celsius to Farenheit, or
        "F" to convert from Farenheit to Celsius
        A temperature

    Processes:
        Converts the temperature using the formula
        Celsius to Farenheit (CF) = F*(9/5)+32
        Farenheit to Celsius (!CF) = (C-32)*(5/9)
    
    Outputs:
        A converted temperature
    
    Assumptions:
        None

*/

#include <iostream>
#include <string>
using namespace std;

void main(){
    //Declare and Initialize variables
    double temp;
    double ConvertTemp;

    //This will hold the C or F to know which conversion
    //to perform
    char theInput;

    //Hold the labels for Celsius and Farenheit to
    //display the output        
    string labels[2] = {"Farenheit","Celsius"};

    //This variable is true if the conversion
    //to be performed is Celsius to Farenheit
    bool CF = true;

//If the user enters an invalid value the program will return to this line
InvalidInput:
    //Output to the user
    cout << "Temperature Converter by Delio Castillo" << endl <<endl;
    cout << "Which type of conversion would you like to perform?" << endl;
    cout << "(enter 'C' to convert from Celsius to Farenheit, or" << endl;
    cout << "'F' to convert from Farenheit to Celsius) ===> ";

    //Accept user input
    cin >> theInput;

    //If the input is not a 'C', 'c', 'F', or 'f' then go back to input    
    if ((theInput != 'c') && (theInput != 'C')
        && (theInput != 'F') && (theInput != 'f')) goto InvalidInput;

    //Accept a temperature input
    cout << "Enter the temperature you want to convert ==> ";
    cin >> temp;

    //If the user wants to  convert from Farenheit to Celsius
    //Set CF to 0 (False)
    if ((theInput == 'F') || (theInput == 'f')) CF = 0;

    if (CF){
        ConvertTemp = (temp * (9.0/5.0)) + 32;
    }
    else
    {
        ConvertTemp = (temp - 32) * (5.0/9.0);
    }

    cout << temp << " degrees " << labels[CF] << " is equal to "
        << ConvertTemp << " degrees " << labels [!CF] << endl;
}
    

    
    
/*  Delio Castillo
    BIS 221 C++
    Charles Godfrey, Instructor
    Spring 2002

    Project Name Project03B

    Purpose of Program
        To convert temperatures from Celsius to 
        Farenheit and viceversa.

    Inputs:
        "C" to convert from Celsius to Farenheit, or
        "F" to convert from Farenheit to Celsius
        A temperature

    Processes:
        Converts the temperature using the formula
        Celsius to Farenheit (CF) = F*(9/5)+32
        Farenheit to Celsius (!CF) = (C-32)*(5/9)
    
    Outputs:
        A converted temperature
    
    Assumptions:
        None

*/

#include <iostream>
#include <string>
using namespace std;

bool CF;
double temp;

double ConvertTemp(double temp, bool CF)
{    
    //This function accepts two parameters
    //a temperature value and an boolean
    //value to decide which conversion to perform
    
    if (CF){
        return (temp * (9.0/5.0)) + 32;
    }
    else
    {
        return (temp - 32) * (5.0/9.0);
    }
}

void main(){
    //Declare and Initialize variables
    //This will hold the C or F to know which conversion
    //to perform
    char theInput;

    //Hold the labels for Celsius and Farenheit to
    //display the output        
    string labels[2] = {"Farenheit", "Celsius"};

    //This variable is true if the conversion
    //to be performed is Celsius to Farenheit
    CF = 1;

//If the user enters an invalid value the program will return to this line
InvalidInput:
    //Output to the user
    cout << "Temperature Converter by Delio Castillo" << endl <<endl;
    cout << "Which type of conversion would you like to perform?" << endl;
    cout << "(enter 'C' to convert from Celsius to Farenheit, or" << endl;
    cout << "'F' to convert from Farenheit to Celsius) ===> ";

    //Accept user input
    cin >> theInput;

    //If the input is not a 'C', 'c', 'F', or 'f' then go back to input    
    if ((theInput != 'c') && (theInput != 'C')
        && (theInput != 'F') && (theInput != 'f')) goto InvalidInput;

    //Accept a temperature input
    cout << "Enter the temperature you want to convert  ==>  ";
    cin >> temp;

    //If the user wants to  convert from Farenheit to Celsius
    //Set CF to 0 (False)
    if ((theInput == 'F') || (theInput == 'f')) CF = 0;

    cout << temp << " degrees " << labels[CF] << " is equal to "
        << ConvertTemp(temp, CF) << " degrees " << labels [!CF] << endl;
}