TAC Three address code Three-address code (tac) will be the intermediate representation used in our Decaf compiler. It is essentially a generic assembly language that falls in the lower-end of the mid-level IRs. Many compilers use an IR similar to TAC. It is a sequence of instructions, each of which can have at

(1) Input There are zero or more quantities that are externally supplied. (2) Output At least one quantity is produced. (3) Definiteness Each instruction is clear and unambiguous. (4) Finiteness If we trace out the instructions of an algorithm, then for all cases, the algorithm terminates after finite number of steps. (5) Effectiveness Every instruction must be basic enough to be carried out, in principle, by a person using only pencil and paper. It is not enough that each operation be definite as in(3); it also must be feasible

CHAPTER 4 Stacks and Queues SI The stack adt 1. ADT A stack is a Last-In-First-Out(LIFO)list, that is. an ordered list in which insertions and deletions are made at the top only Objects: A finite ordered list with zero or more elements

Codes in binary system BCD codes: for decimal digit Gray code: for numbers in binary system; AsCIi code: for characters ey point Use n bits. we can make 2n different words: To make n code-words. you must use logn bits

1. Fill in the blanks with appropriate words according to the text (1) Multimedia is the combination of computer and video technology (2)In fact, Multimedia is just two media: sound and picture (3) Multimedia PC needs to be more

英语作文开头写法大全 一、用于驳性和比较性论文 1. In general, I don't agree with 2. In my opinion, this point of view doesn't hold water. 3. The chief reason why... is that... 4. There is no true that... 5. It is not true that... 6. It can be easily denied than.. 7. We have no reason to believe that

四级作文经典句型总结 上升增长 1. add up to增加了 eg. The total amount of .. added up to 14 billion pounds(14%) in 1994. 2. to jump to/ to soar to..一跃达到/猛增到 eg. The total working days lost soared to 10 million in 1979

2005年12月全国大学英语四级考试真题和答案 Part I Listening Comprehension(20 minutes) Section a 1. A)See a doctor. B Stay in bed for a few days. C)Get treatment in a better hospital D)Make a phone call to the doctor. 2. A)The 2: 00 train will arrive earlie B)The 2: 30 train has a dining car

Part II Reading Comprehension(Skimming and Scanning)(15 minutes) Directions: In this part, you will have 15 minutes to go over the ckly and answer the questions on Answer Sheet 1. For questions 1-7, choose the best answer from the four choices marked A), B), C)and D). For questions 8-10, complete the sentences with the information given in the passage That’ s enough,kids

Semantic analysis Parsing only verifies that the program consists of tokens arranged in a syntactically-valid combination, we now move on to semantic analysis, where we delve deeper to check whether they form a sensible set of instructions in the programming language