Page 23 - Programming Microcontrollers in C

8 Chapter 1 Introduction to C

of course, is less than 11, so the statement following the while will
be executed again and new values will be printed to the screen. This
sequence will be repeated until the incremented value for i equals
11, at which time i<11 will be FALSE. At that point in the pro­
gram, the statement following the while will be skipped, and the
program will have reached its end. The result of executing the above
program is shown in the following table:
i i i
squared cubed

1 1 1
2 4 8
3 9 27
4 16 64
5 25 125
6 36 216
7 49 343
8 64 512
9 81 729
10 100 1000

EXERCISES

1. Write, compile, and execute each of the example programs shown
in this section.

2. Write a program to calculate the Fahrenheit temperature for the Cel­
sius values between 0° degrees and 100° in steps of 10° each. The
conversion formula is F=9*C/5+32. Use integer variables, and ex­
amine the result when you use F=C*(9/ 5) + 32. What went wrong?

Names

Variables, constants and functions in C are named, and the pro­
gram controls operations on these named variables and constants.
Variables and constants are called operands. Names can be as many
as 31 characters long. The characters that make up the name can be
the upper and the lower case letters, the digits 0 through 9, and the
underscore character ‘_’. There are several defined constants and
functions that are used by the compiler. All of these names begin