Page 142 - Standard Handbook Of Petroleum & Natural Gas Engineering

Computer Applications 127

END-Completes the executable statements in each block; followed by a period
at the end of the main program.
Executable Statements

Assignment statements-Assign values by numerical or character constants,
by expressions (see Table 1-29 for arithmetic and set operators), or by input to
variables, array elements, and fields

PIPENUM: = 1;
MAXTEMP: = PTEMP;
LETTER: = [ 1; (* the empty set *)
NAME: = ‘WELL #l’;

Input/Output statements-Two boolean functions that are useful in input
processing are EOF, which is TRUE if the pointer is currently at the end of the
input file and FALSE otherwise, and EOLN, which is TRUE if the pointer is at
the end of the current input line and FALSE otherwise.

Table 1-29
Pascal Operators
Operator Description Operand(s) Type Result Type
.- _- Assignment Any, except file -
+ Addition Integer or real Integer or real
Set union Any set type Same as operand
- Subtraction Integer or real Integer or real
Set difference Any set type Same as operand
Multiplication Integer or real Integer or real
Set intersection Any set type Same as operand
div Integer division Integer Integer
I Real division Integer or real Real
mod Modulus Integer Integer
not Logical negation Boo I e an Boolean
or Disjunction Boo I e an Boolean
and Conjunction Boo I e an Boolean
<= Set inclusion Any set type Boolean
Less than or equal Any scalar type Boolean
- Equivalence Boo I e an Boolean
-
Equality Scalar, set, pointer Boolean
<> Exclusive or Boo I e an Boolean
Inequality Scalar, set, pointer Boolean
>= Set inclusion Any set type Boolean
Greater than or equal Any scalar type Boolean
< Less than Any scalar type Boolean
> Greater than Any scalar type Boolean
in Set membership Left operand scalar Boolean
Right operand: set
with base type same
as left operand