4/21/18
美国正式开始7年制裁中兴。
一个月前，中美贸易站刚刚打响。中国对美国猪肉等产品征收关税。国人拍手称快，说中国已经站起来了，可以和美国公开叫板了。
现在对ZTE的制裁，大家又普遍说中国科技实力还是不行。Trump的制裁让我们认识到这一点。
都是政府主导的舆论，感觉有些奇怪。中兴在两年前就曾经被暂停与美国的一切交易。如果敲响警钟，当时不久应该敲响了？
今天朝鲜宣布“改革开发”，努力发展科技，教育，停止核武器研究。一个月前金正恩刚访问了北京，同时trump说五月要访问朝鲜。
Embedded System interview Question
1. What are static variables? Static variable in a function only remain one copy of itself. Static variable in a module can be used by any function in the module Static function can only be called in its class 2. What are volatile variables? Volatile variables may change its value unexpectedly in the program. The program will check its value every time, it tries to use it. If a variable is not volatile, the program may keep a copy of the var in its cache. 3. What do you mean by const keyword ? A constant variable is a read only variable. You cant change its value else where except initialization. 4. What is interrupt latency? Interrupt latency is the time between the generation of interrupt and the time for interrupt handler to process it. 5. How you can optimize it? We may use polling and message passing for interrupt to handle interrupt immediately. 6. What is size of character, integer, integer pointer, character pointer? The size of character is 1 byte, inte
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