Module 2: Functions, Strings, and Command Line Arguments

First read this page then start coding module with the GitHub classroom link below.
Github Classroom Link: https://classroom.github.com/a/ArSgN6td

Exercise 1:

Palindrome Checking

The code for this exercise is in the exercise1 directory in the module2 repository. Read the description below, and then enter your code in the palindrome.cpp file where it says

// TODO: Write your code here.

When you finish and test your code, write in the README.md file how your code works, and explain how the input is received from the command line via argc and argv[].

Complete a small program to check if the input provided by the user is a palindrome. A palindrome is a string that is the same forward and backwards.

There are two main ways for testing if a string is a palindrome:

Iterate from forward to back, and from back to forward, and check that they are the same.
Create a copy of the string, in reverse, and check that the copy matches the original.

You will implement both. The main portion of the program, provided to you, looks like this:

// The main function, were the program begins.
int main(int argc, char* argv[])
{
    // If the argument count does not equal 2,
    // then print a usage message.
    if (argc != 2)
    {
        cerr << "Usage: " << argv[0]
             << " <string-to-check>" << endl;
        exit(1);
    }

    // Create a new string named inputString.
    string inputString = argv[1];

    // Call check1 function.
    if (check1(inputString))
    {
        cout << inputString << " is a palindrome according to check 1" << endl;
    }
    else
    {
        cout << inputString << " is NOT a palindrome according to check 1" << endl;
    }

    // Call check2 function.
    if(check2(inputString))
    {
        cout << inputString << " is a palindrome according to check 2" << endl;
    }
    else
    {
        cout << inputString << " is NOT a palindrome according to check 2" << endl;
    }

    return 0;
}

Complete the palindrome program using two checks.
check1() and check2() must use two distinct algorithms:
- check1() use two iterators, one from the start and one from the end of the string, to check if the front and back are the same
- check2() copy the string to a new string, in reverse, and compare the two strings using .compare() or ==

Here is some sample output:

$ ./palindrome racecar
racecar is a palindrome according to check 1
racecar is a palindrome according to check 2

$ ./palindrome madamimadam
madamimadam is a palindrome according to check 1
madamimadam is a palindrome according to check 2

$ ./palindrome amanaplanacanalpanama
amanaplanacanalpanama is a palindrome according to check 1
amanaplanacanalpanama is a palindrome according to check 2

$ ./palindrome notapalindrome       
notapalindrome is NOT a palindrome according to check 1
notapalindrome is NOT a palindrome according to check 2

$ ./palindrome               
Usage: ./palindrome <string-to-check>

Exercise 2:

Compiling Multiple Files

To compile the code in the exercise2 directory with g++ the GNU C++ compiler using the following command:

g++ main.cpp one.cpp two.cpp -o program

In the module2 README.md file, explain how the main() function in main.cpp has access to the functions printEven() and printOdd(). Explain both where the function declarations are stored, and the steps the compiler is taking to build the program executable.