Multiplication is one of the four primary arithmetic operations. The operator * (asterisk) operates on two operands to produce the product.
product = operand1 * operand2;product : variable. Allowed data types: int, float, double, byte, short, long
operand1 : variable or constant. Allowed data types: int, float, double, byte, short, long
operand2 : variable or constant. Allowed data types: int, float, double, byte, short, long
int a = 5, b = 10, c = 0;
c = a * b; // the variable 'c' gets a value of 50 after this statement is executedThe multiplication operation can overflow if the result is bigger than that which can be stored in the data type.
If one of the numbers (operands) are of the type float or of type double, floating point math will be used for the calculation.
If the operands are of float / double data type and the variable that stores the product is an integer, then only the integral part is stored and the fractional part of the number is lost.
float a = 5.5, b = 6.6;
int c = 0;
c = a * b; // the variable 'c' stores a value of 36 only as opposed to the expected product of 36.3Corrections, suggestions, and new documentation are very welcomed. They can be contributed to the energia website repository on Github.
The text of the Energia getting started and reference guides are licensed under a Creative Commons Attribution-ShareAlike 3.0 License. The Energia reference is based on the Wiring/Arduino reference. Code samples in the guide are released into the public domain.
Energia sketches are C/C++ based and compiled with the open-source compiler MSPGCC or arm-gcc-none-eabi. The Energia language comes from Wiring. The Energia environment is based on Processing and includes modifications made by Wiring and Arduino.
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