programming-languages

问题 I've been reading that in most cases (like gcc) the compiler reads the source code in a high level language and spits out the corresponding machine code. Now, machine code by definition is the code that a processor can understand directly. So, machine code should be only machine (processor) dependent and OS independent. But this is not the case. Even if 2 different operating systems are running on the same processor, I can not run the same compiled file (.exe for Windows or .out for Linux) on

问题 I've been reading that in most cases (like gcc) the compiler reads the source code in a high level language and spits out the corresponding machine code. Now, machine code by definition is the code that a processor can understand directly. So, machine code should be only machine (processor) dependent and OS independent. But this is not the case. Even if 2 different operating systems are running on the same processor, I can not run the same compiled file (.exe for Windows or .out for Linux) on

问题 I have a special project and I haven't been able to find any information on how I can achieve this. So on this website companies can register and login. When a company is logged in they have an overview of devices and groups where devices can be divided in different groups for easy recognition. Now the hard part of the website is template management. Each device will display a template which could be a general specified template, a template that was assigned to a specific group or to an

问题 I have a special project and I haven't been able to find any information on how I can achieve this. So on this website companies can register and login. When a company is logged in they have an overview of devices and groups where devices can be divided in different groups for easy recognition. Now the hard part of the website is template management. Each device will display a template which could be a general specified template, a template that was assigned to a specific group or to an

问题 From my understanding, the atan2() function exists in programming languages because atan() itself cannot always determine the correct theta since the output is restricted to -pi/2 to pi/2. If this is the case, then the same problem applies to both asin() and acos() , both of whom also have restricted ranges, so then why are there no asin2() and acos2() functions? 回答1: First off, note that the syntaxes of the two arctan functions are atan(y/x) and atan2(y, x) . This distinction is important,

来源： https://stackoverflow.com/questions/16308374/how-do-different-languages-implement-sorting-in-their-standard-libraries

来源： https://stackoverflow.com/questions/16308374/how-do-different-languages-implement-sorting-in-their-standard-libraries

来源： https://stackoverflow.com/questions/2301325/when-to-make-class-and-function

来源： https://stackoverflow.com/questions/4195848/is-there-any-language-where-names-can-include-space-characters

问题 I have no idea how/where to start. I'm supposed to be using python, and more specifically, the ply library. So far, all I've done in create a list of tokens that will be part of the language. That list is given below: tokens = ( # OPERATORS # 'PLUS' , # + 'MINUS' , # - 'MULTIPLY', # * 'DIVIDE', # / 'MODULO', # % 'NOT', # ~ 'EQUALS', # = # COMPARATORS # 'LT', # < 'GT', # > 'LTE', # <= 'GTE', # >= 'DOUBLEEQUAL', # == 'NE', # # 'AND', # & 'OR', # | # CONDITIONS AND LOOPS # 'IF', # if 'ELSE', #