/* CS401:  Introduction to Computer Science
   Week 1 - Code from class
   Instructor:  Lane
*/


/* Program 1:  Our first program
   This program just prints a greeting.
*/

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

// main() is where the program starts executing
int main() {
   cout << "What are you doing?" << endl;
   return 0;
}




/* Program 2:  Using a variable
   This program demonstrates the declaration and use of a 
   simple integer variable.
*/

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

int main() {
   int value;        // this declares a variable

   value = 401;      // assigns the number 401 to value

   cout << "We are taking Computer Science ";
   cout << value << endl;    // displays the number 401

   return 0;
}




/* Program 3:  Converting gallons to liters
   This program asks the user for a number of gallons, then prints
   the amount in liters (i.e., it converts gallons to liters).
*/

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

int main() {
  int gallons, liters;   // two variables that hold important values

  cout << "Enter number of gallons:  ";
  cin >> gallons;

  liters = gallons * 4;  // the conversion is done here

  cout << "Liters:  " << liters << endl;

  return 0;
}