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-.. _arduino-for:
-
-for statements
-==============
-
-Desciption
-----------
-
-The **for** statement is used to repeat a block of statements
-enclosed in curly braces. An increment counter is usually used to
-increment and terminate the loop. The **for** statement is useful
-for any repetitive operation, and is often used in combination with
-arrays to operate on collections of data/pins.
-
-
-
-There are three parts to the **for** loop header:
-
-
-
-``<strong>for</strong> (<strong>initialization</strong>;<strong> condition</strong>;<strong> increment</strong>) {``
-
-
-
-``//statement(s);``
-
-
-
-``}``
-
-|image0|
-
-
-The **initialization** happens first and exactly once. Each time
-through the loop, the **condition** is tested; if it's true, the
-statement block, and the **increment** is executed, then the
-**condition** is tested again. When the **condition** becomes
-false, the loop ends.
-
-
-
-Example
--------
-
-::
-
- // Dim an LED using a PWM pin
- int PWMpin = 10; // LED in series with 470 ohm resistor on pin 10
-
- void setup()
- {
- // no setup needed
- }
-
- void loop()
- {
- for (int i=0; i <= 255; i++){
- analogWrite(PWMpin, i);
- delay(10);
- }
- }
-
-
-
-Coding Tips
------------
-
-The C **for** loop is much more flexible than **for** loops found
-in some other computer languages, including BASIC. Any or all of
-the three header elements may be omitted, although the semicolons
-are required. Also the statements for initialization, condition,
-and increment can be any valid C statements with unrelated
-variables, and use any C datatypes including floats. These types of
-unusual **for** statements may provide solutions to some rare
-programming problems.
-
-
-
-For example, using a multiplication in the increment line will
-generate a logarithmic progression:
-
-::
-
- for(int x = 2; x < 100; x = x * 1.5){
- println(x);
- }
-
-
-
-Generates: 2,3,4,6,9,13,19,28,42,63,94
-
-
-
-Another example, fade an LED up and down with one **for** loop:
-
-
-
-::
-
- void loop()
- {
- int x = 1;
- for (int i = 0; i > -1; i = i + x){
- analogWrite(PWMpin, i);
- if (i = 255) x = -1; // switch direction at peak
- delay(10);
- }
- }
-
-
-
-See also
---------
-
-
-- `while <http://arduino.cc/en/Reference/While>`_
-