Getting Started

Chapter 4: C Types, Operators, and Expressions

hich will scroll by so fast you won’t see it, so you’ll assume the compile was

OT) this warning was? Most complier warnings are

en m ag this error with a warning. It is a

will feel really dumb after an hour of

only to find a lousy missing ‘=’

may seem strange at this point, but they are

xplained fully in later sections. Then they’ll seem really strange.

perat Defined

W

good. Notice how clear (N
ev ore cryptic. Not all compilers will fl
very easy mistake to make, and you
debugging, looking for something obscure,
character. I do this all the time.

Note: Some of these operators
e

Table 1: Arithmetic Operators

O or Name Example

• Multiplication x*y Multiply x times y
  / Division x/y Divide x by y
  % Modulo x%y Provide the remainder of x divided by y

• Addition x+y Add x and y

• Subtraction x-y Subtract y from x
  ++ Increment x++ Increment x after using it
  -- Decrement --x Decrement x before using it


• Negation -x Multiply x by –1

• Unary Plus +x Show x is positive (not really needed)

Table 2: Data Access and Size Operators

Operator Name Example Defined
[] Array element x[6] Seventh element of array x

. Member selection PORTD.2 Bit 2 of Port D
-> pStruct->x Member x of the structure pointed to
by pStruct

Member selection

• Indirection *p Contents of memory located at
  address p
  & Address of &x Address of the variable x