Differences

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+======% (modulo)   ======
+====Description   ====
+Calculates the remainder when one integer is divided by another.  It is useful for keeping a variable within a particular range (e.g. the size of an array).
+====Syntax   ====
+result = dividend % divisor
+====Parameters   ====
+dividend: the number to be divided
+divisor: the number to divide by
+====Returns   ====
+the remainder
+====Examples   ====
+<code arduino>x = 7 % 5;   // x now contains 2
+x = 9 % 5;   // x now contains 4
+x = 5 % 5;   // x now contains 0
+x = 4 % 5;   // x now contains 4
+</code>
+====Example Code   ====
+<code arduino>
+/* update one value in an array each time through a loop */
+int values[10];
+int i = 0;
+void setup() {}
+void loop()
+{
+  values[i] = analogRead(0);
+  i = (i + 1) % 10;   // modulo operator rolls over variable
+}
+</code>
+====Tip   ====
+The modulo operator does not work on floats.
+====See also   ====
+* [[ Arithmetic | division]]
+Source: arduino.cc

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