command line arguments

This is a discussion on command line arguments within the C++ Programming forums, part of the General Programming Boards category; Heya fellow programmers I just ran into these two little variables that are used by convention for some time. argc ...

  1. #1
    Registered User
    Join Date
    Mar 2002
    Posts
    10

    command line arguments

    Heya fellow programmers
    I just ran into these two little variables that are used by convention for some time. argc and argv. How does one get to see the effects of this when running windows Me. For instance look at this program i pasted here below.

    #include <iostream.h>

    int main(int argc, char *argv[])
    {
    if(argc != 2) {
    cout << "you forgot to type your name";
    return 1;
    }

    cout << "Hello " << argv[1] << '\n';

    return 0;
    }


    when i execute this tricky one all i get is the if statement output. Can someone just enlighten me a little please.
    Have a nice day.
    zbap

  2. #2
    Code Goddess Prelude's Avatar
    Join Date
    Sep 2001
    Posts
    9,796
    Make sure you're entering the proper arguments:
    c:\cppTest Julienne Walker
    will bomb, but
    c:\cppTest Julienne
    works just fine.

    If you intend to have the program spit out both a first and last name then you want to test argc for 3 and print argv[1] and argv[2]. Spaces in between the arguments on the command line will cause them to be treated as completely different strings as opposed to one string with internal whitespace.

    -Prelude
    My best code is written with the delete key.

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