long longValue = 1234567890123L; if (longValue >= Integer.MIN_VALUE && longValue <= Integer.MAX_VALUE) { int intValue = (int) longValue; System.out.println("转换成功: " + intValue); } else { System.out.println("值超出 int 范围,转换失败!"); } 问题2:精度丢失 原因:即使 long 值...
ANALYZE_MAX_BOUNCING_PERIOD disabled Analyze the buttons actual debounce value. BUTTON_LED_FEEDBACK disabled This activates LED_BUILTIN as long as button is pressed. BUTTON_LED_FEEDBACK_PIN disabled The pin to use for button LED feedback. INTENTIONALLY_USE_PCI0_FOR_BUTTON1 disabled Activate it...
Arduino library to play multi-track MML music using different sound devices. Introduction This library is a follow-up of the ESP-MusicEngine library. It provides a device independant base to implement playing MML music on different MCUs using various devices. Device independant base class Note that...
< Decoded value / command [max 32-bits] uint8_t bits;// deprecated moved to decodeData.numberOfBits ///< Number of bits in decoded value uint16_t magnitude; // deprecated, moved to decodeData.extra ///< Used by MagiQuest [16-bits] bool isRepeat // deprecated, moved to ...
工作中经常碰到int8_t、int16_t、int32_t、int64_t、uint8_t、size_t、ssize_t等数据类型,所以有必要对此进行梳理。
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The MMA8452Q is a 3.3V max sensor, so you'll need to do some level-shifting between the Arduino and the breakout. Series resistors on the SDA and SCL lines should do the trick. Development environment specifics: IDE: Arduino 1.0.5 ...
( int Type) { cout << "Text=" << Type + 10 << endl; } }; void DisplayMessage(unsigned int Type) { cout << "Text=" << Type << endl; } void main() { unsigned char value = 0; MyClass my; my.DisplayMessage(value) } 运行出来的结果是Text=10,不解,为什么不是Message:Text=...
MySQL参数优化 1:MySQL 默认的最大连接数为 100,可以在 mysql 客户端使用以下命令查看 mysql> show variables like 'max_connections'; 2:查看当前访问Mysql的线程 mysql> show processlist; 3:设置最大连接数 mysql>set globle max_connections = 5000; 最大可设置16384,超过没用 4:查看当前被使用 分享回复2 ...
基本上,我试图使一个库与不同的Arduino系统兼容(而不是Arduino问题)。我遇到的情况是类型不再匹配,因为在int中,类型不再等同于其相同的固定宽度类型。在所提供的有限环境中(没有stdlib等),我为我需要的特性编写了自己的类型特性类。是4.8.1不正确的,这意味着int和int32_t应该被视为不同的类型。或者是4.8....