# sum.c -- summary of C language
# $Id$
# Carlos Duarte <cgd@teleweb.pt>, 980630

Flow control 
	if (expr) stmt1 [else stmt2]
	while (expr) stmt
	for ([expr1]; [expr2]; [expr3]) stmt
	do stmt while (expr)
	break			break from inner for,while,do,switch
	continue		jump next iteration of for,while,do
	return [(expr)]		return `expr' from function
	label: 			place `label'
	goto label 		jump to `label'
	{ [stmt(s);] }

	switch (integral) {	check for possible values of `integral'
	case val1:		list one possible value
	case val2:		list other possible value
	...
	default: 		default, if none other is matched
	}

Operators and precedence
	Assoc.	Operators				Description
	L	() [] -> .				
	R	! ~ ++ -- + - * & (type) sizeof		
	L	* / %					mul, div, mod
	L	+ -					add, sub
	L	<< >>					lshift, rshift
	L	< <= > >=				lt, le, gt, ge
	L	== !=					equal, diff
	L	&					bitwise AND
	L	^					bitwise XOR
	L	|					bitwise OR
	L	&&					logical AND
	L	||					logical OR
	R	?:					a?b:c = if (a) b else c
	R	= += -= *= /= %= &= ^= |= <<= >>= 	assign, do op then assg
	L	,

	. L: left to right
	. R: right to left 
	. table from K&R, 2nd ed, pg. 53
	. precedence decreases down

Escapes on strings and characters
	esc	desc 	usage	dec	oct	hex
	\0	nul 	'\0'	0	000	00
	\a	bel	'\a'	7	007	07
	\b	bs	'\b'	8	010	08
	\t	ht	'\t'	9	011	09
	\n	lf	'\n'	10	012	0A
	\v	vt	'\v'	11	013	0B
	\f	ff	'\f'	12	014	0C
	\r	cr	'\r'	13	015	0D
	\\	\	'\\'	92	134 	5C
	\?	?	'\?'	63	077 	3F	
	\"	"	'\"'	34	042	22
	\'	'	'\''	39	047	27
	\ooo	oct ooo	'\377'	- 	ooo	-
	\xhh	hex hh	'\xff'  - 	-	hh

	. usage column, is relative to chars; to use on strings, double
	  quotes should be used: char '\n', string "\n"