Argc/argv problem

[TheTask1337]

Hello Guys I am beginner at C, but I need to solve this problem with argc/argv. I am working with Linux in this example.
How does that actually work?
Here is my code:

Code: Select all

int main( int argc,char* argv[] )
{
    switch( argc )
{
case 2:
    if( argv[1] == "--help" )
    {
        printf( " This is program's help page!\n\n" );           
    }
    else
    {
    printf( "Invaild argument\n" );
    }
    break;
    };
}

When I compile that (standard $gcc -o file file.c) and run (./file --help ) I get the "Invadil Argument" - the else case thing. Why?

[cameron]

Try getting rid of ; at end of switch.

[BurakCanik]

Don't think that's the issue here because if I recall correctly it's up to you to put that semicolon there. Compiler allows both syntax there if I'm not mistaken.

[TheTask1337]

Yeah, compiler doesn's say anything when the semicolon is there or isn't. But still the problem hasn't been solved by that.

[Natories]

What about a semi-colon after the first printf statement? Could this be a problem?

Also, what does the second to the last "};" used for?

Natories

[TheTask1337]

What about a semi-colon after the first printf statement? Could this be a problem?

Also, what does the second to the last "};" used for?

Natories

Nah, somehow I managed not to copy that semicolon...wut. Gonna put it there now, thanks. But that is not the problem, because compiler would show an error (I had that semicolon in my code). The last "};" is the ending of switch.

[Natories]

Gotcha, didn't know if it was just something specific to Linux or otherwise! Good luck!

Natories

[LuisR14]

Code: Select all

    if( argv[1] == "--help" )

that wouldn't be the right way to compare strings, you'd instead have to use strcmp()

[TheTask1337]

Code: Select all

    if( argv[1] == "--help" )

that wouldn't be the right way to compare strings, you'd instead have to use strcmp()

yeah, later on I figured out this way. But thanks anyway. Also, this works, too.

Code: Select all

if( ( string )argv[1] == "--help" )