C++/C application that accept value in the first place.

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Hi..
I want to know how i'm going to wrote a simple C++/C application that accept value in the first place.

For example..my Application name will be "myCommand" and my value is "50". I will wrote in the command line something like this in unix base "myCommand 50".
then my code will receive the value "50" from the command line then it will print back the value

the original code :

C++

#include <stdio.h>

main() {
int count;
puts("Please enter a number: ");
scanf("%d", &count);
printf("The number is %d \n", count);
}

Please help ??

Posted 25-Mar-13 18:45pm

bunge-bunge

Updated 25-Mar-13 19:13pm

v2

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H.Brydon · Answer 1 · 2013-03-25T19:15:00

Solution 1

Ummm ... Is this a trick question?

C++

#include <iostream>

using namespace std;

int main( int argc, char* argv[] )
{
  cout << "Program name: " << argv[0]
       << "\nArgument: " << argv[1]; << "\n";
  return 0;
}

It sounds like you probably want to call ShellExecute() or a related API with argv[1].

[Edit]You editted your question so that it now asks something different; however I think my answer still answers the updated question. Just ignore the "ShellExecute() part.[/Edit]

Posted 25-Mar-13 19:15pm

H.Brydon

Updated 25-Mar-13 19:27pm

v2

Comments

Sergey Alexandrovich Kryukov 26-Mar-13 1:17am

Right, a 5.
—SA

H.Brydon 26-Mar-13 1:25am

Thank you SA. What goes around comes around!

bunge-bunge 26-Mar-13 1:26am

Thank H.Brydon.
You have point me out the way.
I have changed my scenario in my question for you to understand more about what i really mean

Stefan_Lang 28-Mar-13 5:27am

H.Brydon is correct. Once you've started the program, the input stream will jump to the next line. So you can no longer read the additional information from the command line through standard input functions. The _only_ way to retrieve additional arguments from the command line is by accessing argv and argc!

Of course, if your intention is a dialog-based input, as the code you posted suggests, then it doesn't make sense to write "myCommand 50", because that skips over the programs request to enter a number! In that case you'd start your program with just "myCommand", which in turn will print "Please entere a number", and only then you'll type "50".

Tl;dr:
If your intention is to just pass the value to your program dirctly, use H.Brydons code. If you wish to interact with the user by querying the value, then use your own code, and start your application just with "myCommand".