[code]
//#include<stdio.h>
#include"stdafx.h"
#include<iostream>
#include<string>
//#include <cmath>

using namespace std;

double depth, temperatureCelsius, tempCelToFah;
char usersInput;

string print_introduction() {
    // prints out information to tell the user what this program does.
    //cout << "This program calculates the temperature of the earth when given a depth in kilometers" << endl;
    return "This program calculates the temperature of the earth when given a depth in kilometersn";
}

double celsius_at_depth(double depth) {
    // computes and returns the celsius temperature at a depth measured in kilometers.
    return temperatureCelsius = 10 * depth + 20;
}

double celsius_to_fahrenheit(double celsius) {
    // converts a Celsius temperature celsius to Fahrenheit.
    return tempCelToFah = 1.8*celsius + 32;
}

double print_conclusion(double depth) {
    //return
    // display the conclusion that what is the temperature in both Celsius and Fahrenheit at depth of the earth
    //does all necessary calculations
    celsius_at_depth(depth);
    celsius_to_fahrenheit(temperatureCelsius);
    cout << "The temperature at depth " << depth << " kilometers.  In Celsius the temperature is " << temperatureCelsius << "n... in Fahrenheit it is " << tempCelToFah << " degrees.n";
    return 0;
    //I'm assuming the extra zero in my output comes from this return but I cannot figure out how to get rid of it!!!
}

int main()
{
    //1. print introduction by calling print_introduction() function
    cout << print_introduction() << endl;

    //2. ask user to enter the depth
    cout << "Please enter the depth in kilometers" << endl;

    //3. get user’s input
    cin >> depth;

    //4. print out the conclusion by calling print_conclusion  function
    //cout << print_conclusion(depth); //did not work left zero
    cout << print_conclusion(depth) << endl;

    //5. ask user if he/she wants to continue
    cout << "Would you like to continue? (y/n)?";

    //6. get user’s input
    cin >> usersInput;

    //7. repeat step 2 to step 6 if user picks ‘Y’ or ‘y’
    if (usersInput == 'Y' || usersInput == 'y')
    {
        main();
    }
    else {
        //Stop program
        return 0;
    }
 }
[/code]