Abl-electronic PIC Microcontrollers PIC16 Manuel d'utilisateur télécharger pdf (Page 129)

100

101

All the expressions are optional. If

condition-exp

is left out, it is assumed to be

always true. Thus, “empty” for statement is commonly used to create an endless

loop in C:

for ( ; ; ) {...}

The only way to break out of this loop is by means of 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];

You can also do it like this:

/* valid, but ugly */

for (s = 0, i = 0; i < n; s += a[i] * b[i], i++);

but this 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 we used a null statement (

;) for a loop body.

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Abl-electronic PIC Microcontrollers PIC16 Manuel d'utilisateur Page 129

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