How can you translate natural language in to programming language?

The short answer is you can't - natural language can't always be be translated into a programming language; in fact even people can't always understand natural language and things have to be rephrased to improve understanding. However, work has been done on this and the starting point is that natural language statements are composed of sentences. A sentence, in general, has noun parts and verb parts. Its usually possible to break a sentence into noun parts and a single verb part (this is called parsing). For example: "The quick brown fox jumps over the lazy dog." Has two noun parts (fox and dog) and one verb part (jumps). To convert this into a programming language representation, you need a function (or object) to handle each verb; one function per verb. So after parsing, you might end with a function call such as: (jump fox dog) This is in lisp; one of the most popular languages for natural language interpretation. For more information about natural language, you can look at the works of Terry Winograd.