multiple-languages

问题 I heard some people program in multiple languages in one project. I can't imagine how the languages interact with each other. I mean there is no Java method like myProgram.callCfunction(parameters); never happens or am I wrong? 回答1: Having multiple languages in one project is actually quite common, however the principles behind are not always simple. In the simple case, different languages are compiled to the same code. For example, C and C++ code typically is compiled into machine assembler

问题 I have a variable v in my program, and it may take any value from the set of values \"a\", \"b\", \"c\", ..., \"z\" And my goal is to execute some statement only when v is not \"x\" , \"y\" , or \"z\" . I have tried, for C-like languages (where equality operators compare the actual string values; eg. c#, javascript, php) if (v != \"x\" || v != \"y\" || v != \"z\") { // the statements I want to be executed // if v is neither \"x\", nor \"y\", nor \"z\" } for Pascal-like languages (e.g. plsql)