Changes for page ROS Crash Course

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• Page properties (1 modified, 0 added, 0 removed)

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...	...	@@ -9,7 +9,7 @@
9	9
10	10	Paths, "/" and "." and ".." in navigating directories - absolute vs relative
11	11
12		-data type - binary itself is meaningless unless you say what data the binary represent
	12	+data type - binary itself is meaningless unless you say what information that the binary bits represent
13	13
14	14	declare variables (int, char, string as series of chars)
15	15
...	...	@@ -37,7 +37,7 @@
37	37
38	38	Switch vs if-else differences - number of times expressions are evaluated
39	39
40		-your own function
	40	+write your own function
41	41
42	42	calling with parameters copied as separate set of var values in function
43	43
...	...	@@ -53,6 +53,8 @@
53	53
54	54	Value overflow because not enough number of bits to represent large numbers.
55	55
	56	+Various integer data types - specifier in printf
	57	+
56	56	Homework: implement factorial (1 to 20) calculator
57	57
58	58	in Linux, most things are case-sensitive. (A not equals a)
...	...	@@ -99,3 +99,34 @@
99	99	quick reading of code for publisher node
100	100
101	101	homework: implement message subscriber node according to ROS book
	104	+
	105	+== Day 4 ==
	106	+
	107	+message subscriber.
	108	+
	109	+argc and agrv
	110	+
	111	+node name during ros::init
	112	+
	113	+topic advertise/subscribe explained.
	114	+
	115	+subscribe() only memorises that this node wants messages and what to do with them.
	116	+
	117	+subscribe() - providing name of function. not calling.
	118	+
	119	+publisher while ros::ok() loop.
	120	+
	121	+subscriber spin() loop - handle events.
	122	+
	123	+the double-colon operator: (1) namespace (2) static member of class
	124	+
	125	+pointers are memory addresses
	126	+
	127	+arrow -> operator
	128	+
	129	+array are elements in sequence in memory.
	130	+
	131	+char ~*~* = pointer of pointer of char data.
	132	+
	133	+
	134	+