名称：<< (left shift)
例子：
int m = 1 << 3; // In binary: 1 to 1000 println(m); // Prints "8" int n = 1 << 8; // In binary: 1 to 100000000 println(n); // Prints "256" int o = 2 << 3; // In binary: 10 to 10000 println(o); // Prints "16" int p = 13 << 1; // In binary: 1101 to 11010 println(p); // Prints "26"
// Packs four 8 bit numbers into one 32 bit number int a = 255; // Binary: 00000000000000000000000011111111 int r = 204; // Binary: 00000000000000000000000011001100 int g = 204; // Binary: 00000000000000000000000011001100 int b = 51; // Binary: 00000000000000000000000000110011 a = a << 24; // Binary: 11111111000000000000000000000000 r = r << 16; // Binary: 00000000110011000000000000000000 g = g << 8; // Binary: 00000000000000001100110000000000 // Equivalent to "color argb = color(r, g, b, a)" but faster color argb = a | r | g | b; fill(argb); rect(30, 20, 55, 55);
描述：
Shifts bits to the left. The number to the left of the operator is shifted the number of places specified by the number to the right. Each shift to the left doubles the number, therefore each left shift multiplies the original number by 2. Use the left shift for fast multiplication or to pack a group of numbers together into one larger number. Left shifting only works with integers or numbers which automatically convert to an integer such at byte and char.
将位向左移位。 运算符左侧的数字将由数字指定的位置数量向右移动。 每次向左移动时，数字加倍，因此每个左移将原始数字乘以2.使用左移快速乘法或将一组数字合并成一个较大的数字。 左移仅适用于整数或数字，可自动转换为字节和字符之类的整数。
语法：
value << n
参数：
| value | int: the value to shift |
|---|---|
| n | int: the number of places to shift left |
相关：
- 本文固定链接: http://iprocessing.cn/2017/07/21/936/
- 转载请注明: Hewes 于 Processing编程艺术 发表
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