Unformatted text preview: esigned in such a way that complete Pascal programs could be written
without the use of any GO TO statement. Special control statements for selection
and looping structures were provided for this purpose. To make programs
structured, Pascal programs are composed of blocks. Each block of statements
starts with a Begin statement and ends with an End statement.
Due to the above mentioned features, Pascal is widely recognized as a language
that encourages programmers to write well-structured, modular programs and
instills good programming practices in a programmer. Owing to this reason, it is
recognized as an educational language and is used to teach programming to
Pascal was standardized by ANSI in 1983. Since then several dialects of Pascal
have been made available on different computer systems. An object-oriented
version of Pascal is also available. Pascal is suitable for both scientific and
business applications because it has features to manipulate, not only numbers, but
also vectors, matrices, strings of characters, sets, records, files and lists.
A Pascal program to compute and print the sum of 10 numbers is given in Figure
12.21. The first line of the program contains the name of the program which is
SUMNUMS. This is followed by two comment lines. Any comment can be placed
within the symbols (* and *). Then, all the variables are declared. The variables
SUM and N are declared as real and hence they can be assigned any real number.
Similarly, the variable I, that has been declared to be an integer variable can be
assigned any integer value. The heart of the program starts with the word BEGIN
and ends with the word END. First, the variable SUM is initialized to zero. The
next statement starts a DO loop that reads and computes the sum of the 10
numbers. Finally, the statement having WRITELN prints the result of the
PROGRAM SUMNUMS (INPUT, OUTPUT); (* PROGRAM TO COMPUTE THE SUM OF 10 NUMBERS *)
(* DECLARATION OF VARIABLES *) VAR SUM, N : REAL; VAR I: INTEGER;
(* MATN PROGRAM LOGI...
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This document was uploaded on 04/07/2014.
- Spring '14