///////////////////////////////////////////////////////////////////////////
// Homework:2
// Exercise:1
//
// summary: write a simple program to add numbers specified on the command
// line, so that if the program is named my_add:
//
//      my_add 34 -23  +434 35
//
// would output 480 and then quit
//
// Steps to implement the program:
//
// 
// (1) looping over the command line arguments:
//
//	As you learned in the last homework, argc and argv[] give you access to
//  the command line arguments. Since we want to add up all the command line
//  arguments, write the code to loop over all the command line arguments (if any
//  and print them to the screen. If there are none, output "no arguments provided"
//
// (2) convert each string to an integer (write a function int atod(char *)).
// To add the arguments, you'll have to convert them into an int first. Using
// the fact that argv[1], argv[2], ... are all null ('\0')-terminated character
// arrays, write a function:
//
//      int atod(char s[])
//
// that expects a null-terminated character array that begins with a '+', '-', or
// digit (0-9). In this function you'll first loop through the string, accessing
// the array using subscripting (i.e. s[3], s[4], etc.) ,
// looking through for the terminating '\0' that signals the end of the string.
// Take, for example, the string to be "123" (4 characters long). After finding
// the end of the string loop backward over the string, again using 
// subscripting, and read in each digit of the number, a character at a time.
// If the character is a digit, you can convert it to a number using
// the fact that '9'-'0' == 9
// When you run out of digits, check for an explicit + or - sign and flip the  sign
// of the number as necessary.
//
// (3) call this function on each of the command line arguments, add up the total
// then output the number
//
//
//
//
//
///////////////////////////////////////////////////////////////////////////

#include <iostream.h>
int main(int argc, char *argv[])
{

	// # of command line arguments = argc-1, so if argc==1, no args
	if (argc > 1) 
		cout << "first argument is " << argv[1] <<'\n';
	else
		cout << "no command line arguments";
		
	return 0;
}