酸豆角作坊

文章目录课程知识点课程知识点1. goto语句Error Handler: 像C++和或者Java，当遇到error的时候它们会提供exception接口。C语言中可以通过goto语句来实现从多重判断里直接退出到error handler里。但是一般我们不用goto语句，首先它不利于debug，其次所有用goto语句写的code我们都可以用别的if else之类的来替代。在我接触到的产品code里，因为项目非常庞大，确实在code style里面明确声明不能使用goto语句，以防止后期代码维护.

文章目录课程知识点课后练习课程知识点1. extern关键字Enables access/modifying of global variable from other source files2. 多个.c文件一起gcc编译 e.g. gcc -g -O0 -Wall diophant.c euclid.c -o diophant.o3. variable scope 变量作用域variables declared outside of a function have global.

文章目录课程知识点课后练习课程知识点signed 和unsigned的区别【疑问】如果它们只是表示范围的不同，只体现在算术表达式上的差别的话，为什么char也有unsigned的格式啊？大端和小端的问题Big endian: the most significant bits(MSBs) occupy the lower address.网络中常常使用大端，所以它也被成为网络orderLittle endian: the least significant bits(LSBs) .

课程重点速记C is a low-level language. low-level is also known as machinelevel language.gdb on MAC M1 gdb is not support, but you can use lldb.strings stored as character arraynull-terminated (last character in array is ‘\0’ null) not writen explici