Datasheet

FOR STATEMENT
The for statement implements an iterative loop. The syntax of the for statement is:
for ([init-expression]; [condition-expression]; [increment-expres-
sion]) statement
Before the first iteration of the loop, init-expression sets the starting variables for
the loop. You cannot pass declarations in
init-expression.
condition-expression is checked before the first entry into the block; statement
is executed repeatedly until the value of condition-expression is false. After each
iteration of the loop, increment-expression increments a loop counter. Conse-
quently, i++ is functionally the same as ++i.
All expressions are optional. If condition-expression is left out, it is assumed to
be always true. Thus, “empty” for statement is commonly used to create an end-
less loop in C:
for ( ; ; ) statement
The only way to break out of this loop is by means of the break statement.
Here is an example of calculating scalar product of two vectors, using the
for statement:
for ( s = 0, i = 0; i < n; i++ ) s += a[i] * b[i];
There is another way to do this:
for ( s = 0, i = 0; i < n; s += a[i] * b[i], i++ ); /* valid, but
ugly */
but it is considered a bad programming style. Although legal, calculating the sum
should not be a part of the incrementing expression, because it is not in the service
of loop routine. Note that null statement (;) is used for the loop body.
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MIKROELEKTRONIKA - SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD
Language Reference
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CHAPTER 5