Solved

Input arguments

Posted on 2006-11-23
2
285 Views
Last Modified: 2010-04-15
Hi,

I'm pretty new to C, but having a slight problem with bringing in variables from the command line. To run the program you type in:   test 1 2 3

and the start of my code looks like this:

---
int main(int argc, char **argv)
---

So now I really want to be able to store the value as an integer, but at the moment I'm just trying to print out to the screen, but I can't get this right. How come the following won't work:

---
printf("number 1 is %d \n", argv[1]);
printf("number 2 is %d \n", argv[2]);
printf("number 3 is %d \n", argv[3]);
--

Can anyone help?

Thanks in advance,
DJ.
0
Comment
Question by:dj_humpyg
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 24

Accepted Solution

by:
fridom earned 275 total points
ID: 18003742
argv is a vector of "strings"

So you have to use the proper modifier.
Try

printf("argc[1] = %s\n", argv[1]); ...

If you really want to use the %d you have to make an interger from a string.
Lookup atol or maybe sscanf.

Regards
Friedrich

0
 

Author Comment

by:dj_humpyg
ID: 18003808
Many thanks for the quick reply.

I understand now, thanks for the clarification. It's now all sorted and working, it printed to the screen fine and I used the atoi function.

Thanks,
DJ.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Have you thought about creating an iPhone application (app), but didn't even know where to get started? Here's how: ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Important pre-programming comments: I’ve never tri…
Summary: This tutorial covers some basics of pointer, pointer arithmetic and function pointer. What is a pointer: A pointer is a variable which holds an address. This address might be address of another variable/address of devices/address of fu…
Video by: Grant
The goal of this video is to provide viewers with basic examples to understand and use for-loops in the C programming language.
Video by: Grant
The goal of this video is to provide viewers with basic examples to understand and use nested-loops in the C programming language.

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question