14 Jun 96 11:32, Paul Edwards wrote to Frank Adam:

 > I can't remember though - does the "const" in strstr() mean that you 
 > aren't changing the data that the pointers point to, or that you aren't
 > changing the pointers themselves?  BFN.  Paul.

The former.  You can modify a const pointer (ie. perform pointer
addition/subtraction), and read the data pointed to by the pointer, just
not write to the data the pointer points to.

int main(void)
{
    char *ptr;
    const char *cptr;

    ptr++;        /* this is legal */
    cptr++;       /* this is legal too */

    *ptr = 'A';   /* this is legal */
    *cptr = 'A';  /* this is not! */

    return 0;
}

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