## A Practical Introduction to Pascal by I. R. Wilson

By I. R. Wilson

The recognition of Pascal as a educating language has speedily elevated, as confirmed via Addyman's survey performed over a11 ecu and American associations (Comput. Bull., Se ries 2,8, June 1976,31). this can be due either to the fascinating gains of the language and to the convenience of manufacturing an effective com piler. for example of the latter, the authors have investigated the entire CDC CYBER compiler and located it to throughput at 1.8 occasions the speed of the manu facturer's Fortran compiler. those gains of the language and compilers have additionally been favourably looked by means of approach programmers and clients of rnicroprocessors. within the latter box, it's the trust of the authors that Pascal will supersede the programming language simple. particularly, undergraduates within the division of desktop technology at Manchester college application mostly in Pascal. An introductory le~ture path on simple programming suggestions, given at Manchester, has been taken as a foundation for this ebook. as well as lectures, the direction includes different types of sensible consultation. the 1st relies at the answer of brief pencil-and-paper workouts. the second one calls for the coed to put in writing entire courses and run them in an 'edit and pass' mode on interactive computing device terminals. every one bankruptcy of the ebook conc1udes with workouts and difficulties appropriate for those reasons. even if options to a11 of those will not be awarded within the booklet, instructing employees may perhaps receive them via software to the authors.

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31 ; I I ; (. •) The Standard Scalar Types The standard scalar types and the operations provided for them have been described in earlier chapters. For some of the standard scalar types, there are a few details relating to the concept of type which have not yet been described. Integer In mathematics there is an infinite number of whole numbers. The type integer in Pascal is, in fact, a subrange of the integers. The subrange is -MAXINT .. MAXINT where MAXINT is an implementation-dependent constant.

Thus two real values may not safely be compared for equality. (b) Integer values (constants, variables and subexpressions) may be used in a real expression without qualification. The integer value is automatically converted to the corresponding real value. 4 Integer The integer operators are +- VARIABLES, CONSTANTS AND EXPRESSION~ 25 and with greater precedence *DIY MOD where DN is division of non-negative integer values giving a truncated integer result and MOD gives the remainder. 2) could be MDIYN*N=M or M MOD N = 0 Integer constants have the normal arithmetic form and, in general, may be preceded by a+ or-.

You may assume that the gangplank is raised when exactly 200 animals have boarded. 1 Write a program to tabulate the values of the squares, cubes and factorials of all integers from 1 to 100. 2 Write a program to count the number of prime numbers less than 500. A prime number is a positive integer which does not divide exactly by any other positive integer. One technique (not by any means optimal} is to determine for each num· ber whether it divides exactly by any number less than it. 1 The Different Types of Variable and Constant In previous chapters we have used only real and integer variables.