command line arguments

[tmadhavi17]

Hi there!
I am new to c language and especially in dealing with command line arguments. I came across a program which takes a dir name as argument. I got a doubt at the point where they were doing some validation like this and was quite puzzled of why they compared it so..

if (! strcmp(argv[1],"/?&quot){
printf("\nUsage:\>directory for xxx - Alpha Numeric, 8 or less chars)\n\n"
exit(0);
}

If I have to do it, I thought that I will check if "argc>1" or not (ofcourse, they did this too).

Any ideas what does comparing argv with "?" does mean??

cheers
-M

 

[JOLESEN]

Because it is more or less a de-facto standard that one can ask the program to display the possible arguments / switches etc.
Normally you will use '/?' for this.

Example :

myprogram.exe /?

Could produce this output ... or whatever .... :
Usage : myprogram inputfile outputfile
/JOlesen

 

[tmadhavi17]

Thanks Jolesen!
That clears my mind.

cheers
-M