Learning C++

I just started to learn c++ and wrote a simple little calculator program, but i wanted to know what i would need to do to accept command line arguments so that it can work like this:

C:\> calc.exe 5 * 5

5 * 5 = 25

Here is the code that i got so far:

======================calc.cpp===================

Code:

#include <iostream>

int main()
{

int v1, v2, total;

char type;

std::cin >> v1 >> type >> v2;

switch ( type )
	{
		case '+':
		total = v1 + v2;
		std::cout << v1 << " + " << v2 << " = " << total << std::endl;
		break;
		
		case '-':
		total = v1 - v2;
		std::cout << v1 << " - " << v2 << " = " << total << std::endl;
		break;

		case '*':
		total = v1 * v2;
		std::cout << v1 << " * " << v2 << " = " << total << std::endl;
		break;

		case '/':
		total = v1 / v2;
		std::cout << v1 << " / " << v2 << " = " << total << std::endl;
		break;

		default:
		std::cout << "Incorrect format (number * number)" << std::endl; 
		
	}

	return 0;

}

==============================================

Any help is appreciated.

tick tick
http://faq.cprogramming.com/cgi-bin/...&id=1043284392

Here is what i got so far but it doesn't want to compile:

Code:

#include <iostream>

int main(int argc, char *argv[])
{

int total;

	switch ( argv[2] )
		{
			case '+':
			total = argv[1] + argv[3];
			std::cout << argv[1] << " + " << argv[3] << " = " << total << std::endl;
			break;
					
			case '-':
			total = argv[1] - argv[3];
			std::cout << argv[1] << " - " << argv[3] << " = " << total << std::endl;
			break;

			case '*':
			total = argv[1] * argv[3];
			std::cout << argv[1] << " * " << argv[3] << " = " << total << std::endl;
			break;

			case '/':
			total = argv[1] / argv[3];
			std::cout << argv[1] << " / " << argv[3] << " = " << total << std::endl;
			break;
			*/
			default:
			std::cout << "Incorrect format (number * number)" << std::endl; 
		
		}

	return 0;

}

Below are the compile errors that i am getting:

Borland C++ 5.5.1 for Win32 Copyright (c) 1993, 2000 Borland
calc2.cpp:
Error E2383 calc2.cpp 12: Switch selection expression must be of integral type i
n function main(int,char * *)
Error E2085 calc2.cpp 15: Invalid pointer addition in function main(int,char * *
)
Warning W8057 calc2.cpp 41: Parameter 'argc' is never used in function main(int,
char * *)
*** 2 errors in Compile ***

Well each argv[n] is a \0 terminated character string.

So to test a single letter, use switch ( argv[2][0] )

> total = argv[1] + argv[3];
Being strings, you need something like strtol() or strtod() to convert from a string to an int.

Cool it works, thanks a lot for your help.