Thread: Parsing cmd line arguments as variables

Hi everyone, I was just wondering if there was a standard function in C/C++ where you could convert a string of numbers to separate integer variables. For instance,

Code:

char *argv[];
argv = "1 2";
int numberone = 1;
int numbertwo = 2;

So I basically need a function where I can parse two command line variables as integers.

Thanks, Graison

strtol conveniently tells you where it stopped reading one number, which will easily allow you to start reading a second number.

EDIT EDIT EDIT: You also need to read that bit about command-line arguments again. You will not get all your command line arguments in one string. You will get each command line argument in its own string.

First you need to understand how command line arguments work in C...

Code:

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

The integer value argc tells you how many command line arguments there are. You need to check this to be sure the command line was correctly entered by the user and to know how many argv[] strings to expect.

The character arrays at argv[] will contain one string for each command line parameter. The breakpoint in unquoted command lines is a space...

Thus if the user enters... myprog 1 2 3 ... argc should contain 4 meaning there are 4 parameters. The breakdown is like this...
argv[0] = myprog
argv[1] = 1
argv[2] = 2
argv[3] = 3

These are string variables. You can convert the strings to numerical values with atoi() and similar functions.

Tater is correct . . .v/

Originally Posted by Vxyz

Tater is correct . . .v/

I've just added you to my ignore list...

Now be a decent person and Stop clicking the "like" button on all my posts

I find you to be both stupid and beyond annoying.

That's not very nice :-\.

The like button exists for a reason - there's a reason stack overflow makes an epic resource - the best answers are thumb-upped - agreed upon by others.

I think he can just as easily counter with: "Stop answering questions correctly, then" .

Originally Posted by AndrewHunter

Let's stick with the topic at hand. If we keep allowing trolls to get us off topic then this site will degrade into all those other useless ones out there. If you would like to have a conversation, PM Tater. Or perhaps you could even start a thread in General Discussions about the topic you would like to discuss. I did that here a little bit ago. Eitherway, a thread in the C board is not the place to do it.

Agreed... That's why I put him (gleaned from his newly started blog ... and he calls me "dear"!) in my ignore list. Now I don't heve to waste my time on his posts.

Yes, please... Back to the OP's question...

Thank you so much CommonTater. Also, I know how you use command-line variables with

Code:

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

but you answered my question perfectly!