use of if (!cptr) and if (cptr), where cptr is a *)

[Dean Rubine]

A slightly better use of a comma in a while expression is:

	while(printf("? "), gets(line) != NULL) {
		... whatever ...
	}

I think it beats the alternatives:
	
	for(;;) {
		printf("? ");
		if(gets(line) == NULL)
			break;
		... whatever ...
	}

	       -- or --

	for(printf("? "); gets(line) != NULL; printf("? ")) {
		... whatever ...
	}
	

I also occasionally use the comma to save braces:

	if((f = fopen(file, "r")) == NULL)
		fprintf(stderr, "Can't open %s\n", file), exit(2);


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