en:reference:language:arithmetic

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+ | ====== Addition, Subtraction, Multiplication, & Division ====== | ||

+ | |||

+ | |||

+ | ===== Description ===== | ||

+ | |||

+ | 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. | ||

+ | |||

+ | |||

+ | ===== Examples ===== | ||

+ | <code cpp> | ||

+ | y = y + 3; | ||

+ | x = x - 7; | ||

+ | i = j * 6; | ||

+ | r = r / 5; | ||

+ | </code> | ||

+ | ===== Syntax ===== | ||

+ | <code cpp> | ||

+ | result = value1 + value2; | ||

+ | result = value1 - value2; | ||

+ | result = value1 * value2; | ||

+ | result = value1 / value2; | ||

+ | </code> | ||

+ | ===== Parameters: ===== | ||

+ | |||

+ | value1: any variable or constant | ||

+ | value2: any variable or constant | ||

+ | |||

+ | |||

+ | ===== Programming Tips: ===== | ||

+ | |||

+ | * 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. | ||

+ | |||

en/reference/language/arithmetic.txt · Last modified: 2017/04/07 10:03 (external edit)