Thread: need help with a small bug

Ok, I know how the palindrome program works. I did it earlier this year, and now the teacher wants it using command line arguments.

PHP Code:

int main(int argc, char *argv[])
{

    int len, i, run,
    match = 1;

    if (argc > 1)
    {
    len = strlen(argv[1]);
    run = len/2;

    for( i=0; i<run; i++ )
    {
        if ( argv[1][i] != argv[i][len-i-1] )
        {
        printf("%d:   %c != %c\n", i, argv[1][i], argv[1][len-i-1]);
        match = 0;
        }
        else
        printf("%d:   %c == %c\n", i, argv[1][i], argv[1][len-i-1]);

    }

    if (match)
        printf("%s is a palindrome!!!\n\n", argv[1]);
    else
        printf("%s is not a palindrome.\n\n", argv[1]);

    }
} 


I have been working on a project for a few days, and my brain is fried. Can anyone tell me what I have messed up here. If if give call it like "prog abba", it says the a's are not equal, but the b's are. Any ideas?

Thanks for any help.