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This example is for Wiring version 1.0 build 0100+. If you have a previous version, use the examples included with your software. If you see any errors or have comments, please let us know.

Iteration.
Iteration with a "for" structure constructs repetitive structures.

    void setup()
    {
      Serial.begin(9600);
      for (int i = 0; i < 100; i++)   // prints numbers from 0 to 99
      {
        Serial.print(i);
        Serial.print(" ");
      }

      for (char c = 'A'; c <= 'z'; c++)   // prints all characters between 'A' and 'z'
      {
        Serial.print(c);
        Serial.print(" ");
      }
    }

    void loop()
    {
    }