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arduino:arithmetic_operators:arithmetic

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These operators return the sum, difference, product, or quotient (respectively) of the two operands. The operation is conducted using the data type of the operands, so, for example, *9 / 4* gives *2* since 9 and 4 are ints. This also means that the operation can overflow if the result is larger than that which can be stored in the data type (e.g. adding 1 to an int with the value 32,767 gives -32,768). If the operands are of different types, the “larger” type is used for the calculation.

If one of the numbers (operands) are of the type **float** or of type **double**, floating point math will be used for the calculation.

y = y + 3; x = x - 7; i = j * 6; r = r / 5;

result = value1 + value2; result = value1 - value2; result = value1 * value2; result = value1 / value2;

value1: any variable or constant

value2: any variable or constant

* Know that integer constants default to int, so some constant calculations may overflow (e.g. 60 * 1000 will yield a negative result).

* Choose variable sizes that are large enough to hold the largest results from your calculations

* Know at what point your variable will “roll over” and also what happens in the other direction e.g. (0 - 1) OR (0 - - 32768)

* For math that requires fractions, use float variables, but be aware of their drawbacks: large size, slow computation speeds

* Use the cast operator e.g. (int)myFloat to convert one variable type to another on the fly.

Source: arduino.cc

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arduino/arithmetic_operators/arithmetic.txt · Last modified: 2013/02/15 20:45 (external edit)

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