*

[Arithmetic Operators]

描述

Multiplication is one of the four primary arithmetic operations. The operator * (asterisk) operates on two operands to produce the product.

語法

product = operand1 * operand2;

參數

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.

範例程式碼

int a = 5;
int b = 10;
int c = 0;
c = a * b;  // the variable 'c' gets a value of 50 after this statement is executed

Tips

1. The multiplication operation can overflow if the result is bigger than that which can be stored in the data type.
2. If one of the numbers (operands) are of the type float or of type double, floating point math will be used for the calculation.
3. 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;
float 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 36.3

語法參考主頁面

86Duino 參考的文本是根據 Creative Commons Attribution-ShareAlike 3.0 License，部分文本是從 the Arduino reference 修改的。 參考中的代碼示例已發佈到公共領域。