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Exercises

4. Memorize the following definitions:

1. FORTRAN is a problem oriented high level programming language for scientific and mathematical use. It is a compiler language. 2. PL/I is a general-purpose high level programming language for scientific and commercial applications.

5. Answer the following questions:

1. What is FORTRAN? 2. What are low level languages oriented to? 3. What are high level languages oriented to? 4. When was FORTRAN developed? 5. What does a FORTRAN program consist of? 6. Who assigns alphanumeric names to data items? 7. Which forms may data items in FORT-RAN take? 8. By means of what are the actual operations expressed in FORTRAN? 9. How is a program in FORTRAN structured? 10. What do segments in a FORTRAN program consist of? 11. When was PL/I introduced? 12. What is PL/1? 13. What does PL/1 aim at? 14. What are the more important features of PL/1? 15. How many symbols does PL/1 use? 16. What logical statements does PL/1 use?

6. Compare fortran and pl/I.

7. Speak on:

a) arithmetic and logical assignment statements in FORTRAN;

b) the features of the general-purpose PL/1.

8. Translate the following sentences paying attention to the meaning of the words given below:

a) structure – структура, конструкция, строение

to structure – строить, конструировать, создавать

1. The structure of this device is very complex. 2. The block structure of ALGOL is of great value because it permits the parts of a program to be written by different programmers. 3. The words of a language are structured directly from the characters which are usually the smallest units that have meaning by themselves. 4. The program of FORTRAN is structured in segments.

b) master – главный, основной

to master – управлять, руководить, совершенствовать

1. A master card is a punched card-holding any fixed information about a group of cards. 2. Master data are data elements of a record which seldom change. 3. We have to master our knowledge in mathematics and English. 4. The CPU masters the actual calculations inside the computer.

c) to state – устанавливать

state – государство, штат, состояние

1. Programming languages offer various ways for a programmer to state precisely the order of instructions which is often known as the "sequence of control". 2. Scientists of the Soviet State take an important part in international conferences and symposiums. 3. Lights and signals on the control panel show the electrical state of the computer.

d)aim – цель, намерение

to aim – иметь целью

1. The aim of this paper is to show the organization of a memory made on thin films. 2. PL/1 aims at mathematical and economical use. 3. This equipment aims at printing results on cards and displaying them on screens.

e) only – только

the only – единственный

1. In computers only two electrical states are used, 1 for one state, and 0 for the other. 2. The idea of an automatic computer that would not only add, multiply, subtract, and divide but perform a sequence of reasonable operations automatically was given by the English scientist Charles Babbage. 3. It was the only way to solve this problem. 4. Petrov is the only student in our group who had worked at the computing centre before entering the Institute. 5. The access time is only a few millionth of a second for magnetic cores. 6. The printers are used only for output unit.