_____ are the systems special characteristics that appeal to users.

An expert system uses _________ , or rules of thumb, to arrive at conclusions or make suggestions.

What does the following line do? memset((char *)&ctl_addr, 0, sizeof(ctl_addr));

Where would you expect to encounter the following code? for (i=1; i<argc; i++) { if (argv[i][0] == '-') {