Command Line Arguements

I am trying to write a program which uses command line arguements and options. The part I am have trouble with is arranging all the different combinations. For example the options are as follows: -c, -a, -t, -p, -cp, -ca, -ct, -ctp, -tca, -tcap, and etc... for every possible combination. Or you can have the options seperated like -c -a -t, etc. My problem is this. How should I write the code so that when an option is chosen such as -cta, it wouldnt matter if the user put in that of -atc. What I am thinking is that I should convert the characters to the hex or decimal format and the sum of them would be the same no matter what combination..but how would I do that? Or should I do it someother way? Please help... Thanks in advance!

-Chris

I haven't tried compiling this:

Code:

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for( i = 1; i < argc; i++ ) {
    if( argv[i][0] == '-' ) {
        for( j = 1; j < strlen( argv[i] ); j++ ) {
            switch( argv[i][j] ) {
                case 'a':
                    // Do something...
                    break;
                case 'c':
                    // Do something...
                    break;
                case 't':
                    // Do something...
                    break;
                case 'p':
                    // Do something...
                    break;
            }
        }
    }
}

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Thank you so much for the quick replies. They both worked great. Thanks again for your help!