Page 50 - Programming Microcontrollers in C

Precedence and Associativity 35

< <= > => left to right

== != left to right
& left to right

^ left to right
| left to right

&& left to right
|| left to right

?: right to left
= += -= *= /= %= &= ^= |= <<= >>= right to left

, left to right
Note the very high precedence of the parentheses and the square
brackets. It is the high precedence of these operators that allows the
programmer to force operations that are not in line with the normal
precedence of the language. The second highest precedence is the
list of unary operators. These operators are all associated from right
to left.

EXERCISES
1. Which of the following words are valid names for use in a C pro­
gram?

able toots
What_day_is_it WindowBar
_calloc 8arnold
Hurting? value
constant Constant
sizeof continue
2. Write a program to evaluate the constant

( 1.0377x107 + 3.1822x103 ) / ( 7.221x104 + 22.1x106 )
The answer will be 0.468162.

3. Write a function that raises the integer x to the power n. Name the
function x_to_the_n, and write a program that evaluates
x_to_the_n for several different values of both x and n.