if else
comparison operator
Logical operators
when curly braces are optional
ternary operators
sleep
scope
recursion
main() return 0
global vs static.png
escape sequence
11 / 3 = 3 or 3.666667
NSInteger vs. NSUInteger
while loop and for loop
break
continue
address in pointers
get data at an address
sizeOf()
pass by reference
write passing by reference functions
stack and heap
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