/**
 *  This file contains instructions and information
 *  for lab 1 of CS588.
 *
 *  Author: Travis Desell
 *  Copyright: Travis Desell & The University of North Dakota, 2015
 *
 *  This lab introduces some looping structures, and does some
 *  string and character manipulation, with the end goal of
 *  being able to print out the sum of a list of numbers entered
 *  on the command line.
 *
 *  You can compile this with:
 *      g++ -Wall 2015_lab1.cxx -o lab1
 *      or:
 *      clang++ lab1.cxx -o lab1
 *
 *  There the '-o lab1' means output the executable generated by
 *  the g++ or clang compiler as a file called 'lab1'.  You can
 *  then run the program with:
 *      ./lab1 <command line arguments>
 *  From a linux/unix console.
 */


/**
 *  We need to include iostream to be able
 *  to use cout and endl.
 */
#include <iostream>

/**
 *  The stdlib.h header file includes the 'atof'
 *  function which we need to convert a character
 *  array into a floating point number.
 */
#include <stdlib.h>


/**
 *  You need to implement this sort3 function.  Make sure the
 *  command line parameters are correct.  When sort3 completes
 *  the following should be true:
 *      n1 >= n2 >= n3
 *
 */
void sort3(int n1, int n2, int n3) {
}


/**
 *  The main function typically takes as arguments an
 *  integer (the number of command line arguments) and
 *  an array of an array of characters (the actual
 *  arguments).
 *
 *  If you run this:
 *  ./lab1 5 19 -3
 *
 *  The number of arguments will be 6, and each will be:
 *      lab1
 *      5
 *      19
 *      -3
 */
int main(int number_of_arguments, char** arguments) {
    /**
     * The purpose of lab 1 is to write a program
     * which sorts the three numbers passed to
     * the command line.
     *
     * Remember that since the first command
     * line argument is the program executable, it
     * should be skipped.
     */
    for (int i = 0; i < number_of_arguments; i++) {
        //Print out each command line argument here
        std::cout << "arguments[" << i << "] = " << arguments[i] << std::endl;
    }

    /*
     *  It's always good to check that the input to the
     *  program is correct.  We need to make sure that
     *  there actually were 3 command line parameters
     *  passed.
     */
    if (number_of_arguments != 4) {
        std::cout << "ERROR: incorrect command line parameters, proper usage is: " << std::endl;
        std::cout << "    " << arguments[0] << " <n1> <n2> <n3>" << std::endl;

        exit(1); //exit(1) exits the program with a return value of 1, for an error
    }

    /*
     *  The atoi function converts a char* (an array of characters) to an
     *  int, if it is possible.
     */
    int n1 = atoi(arguments[1]);
    int n2 = atoi(arguments[2]);
    int n3 = atoi(arguments[3]);

    std::cout << "The three numbers are: " << n1 << ", " << n2 << ", " << n3 << std::endl;

    /*
     *  You need to implement this sort3 function
     */
    sort3(n1, n2, n3);

    std::cout << "The three sorted numbers are: " << n1 << ", " << n2 << ", " << n3 << std::endl;

    return 0;   //return 0 for success
}