Programming for Microprocessors

142

High-level languages

(b) 100 FOR J = 1 TO 101 STEP 10 J:= 1

110 PRINT J WHI1

120 NEXT J PI

WHILEJ<=101DO;

PRINT (J);

J := J+10 END;

(Note that the FOR statement of BASIC is actually a structured con-

These four constructions allow GOTOs and labels to be eliminated in

almost every context, although sometimes the removal is somewhat

artificial. A good practical rule for the would-be structured program is:

• Never use a backward GOTO, i.e. one to a place earlier in the pro-

• Use a forward GOTO only if the code is genuinely simplified as a

result.

Discussion

In every project, the design engineer must make a decision whether to

use a high-leve ...