unsigned long

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本文详细介绍了Arduino编程中Unsigned long变量的使用方法、存储原理及应用实例，包括其语法、赋值方式和与其他数据类型的区别。通过具体代码示例帮助开发者掌握如何在Arduino项目中高效利用Unsigned long变量。

Description

Unsigned long variables are extended size variables for number storage, and store 32 bits (4 bytes). Unlike standard longs unsigned longs won't store negative numbers, making their range from 0 to 4,294,967,295 (2^32 - 1).

Example

unsigned long time;

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  Serial.print("Time: ");
  time = millis();
  //prints time since program started
  Serial.println(time);
  // wait a second so as not to send massive amounts of data
  delay(1000);
}