+

[Arithmetic Operators]

描述

Addition is one of the four primary arithmetic operations. The operator + (plus) operates on two operands to produce the sum.

語法

sum = operand1 + operand2;

參數

sum: 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 15 after this statement is executed

Tips

1. The addition operation can overflow if the result is larger than that which can be stored in the data type (e.g. adding 1 to an integer with the value 32,767 gives -32,768).
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 sum 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 12 only as opposed to the expected sum of 12.1

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。