Code Writing: 
Write a C program that will take as a command line argument a non-negative, 
whole number, decimal value: 

	<./a.out> <decimal integer>

Your program need only perform rudamentary error checking and will only check to see that 
there were two inputs to the program.  If this was not the case then your program will 
display an error message e.g., "Enter only two arguments to the program" and
terminate execution.

Assuming that the input was correctly entered then the program will convert the second command
line argument from a string to an integer.  It will then display the argument as an integer
on a single line and the value of the argument squared on a line below it.

For example, if the person typed in the following as the program was run:

./a.out 10

Then the program would display the following:

Original number: 10
Original number squared: 100