SIMSCRIPT II.5 Programming Language

Programming Language Concepts
constant
or
constant to constant
the mode of expression and each constant must agree, in accordance with the following rules:
1. If expression is numeric (integer, real or double), then each constant must be numeric.
2. If expression is alpha or text, then constant must be a literal string delimited by quotation
marks,
e.g., "string".
3. If expression is a subprogram variable, constant must be a subprogram literal (see
paragraph 2.30) delimited by single apostrophes, e.g., 'sin.f'.
Each statement group is a sequence of 0 or more SIMSCRIPT statements.
The following example emulates a simple calculator:
define OPERATION as a text variable
define OPERAND1, OPERAND2 and RESULT as real variables
until OPERATION = "halt"
do
read OPERATION, OPERAND1 AND OPERAND2
select case OPERATION
case "+"
let RESULT = OPERAND1 + OPERAND2
case "-"
let RESULT = OPERAND1 - OPERAND2
case "*"
let RESULT = OPERAND1 * OPERAND2
case "/"
let RESULT = OPERAND1 / OPERAND2
case "halt"
default
print 1 line with OPERATION thus
******** is not a valid operation.
endselect
loop
The cases may be overlapping, in which case the first matching case will be selected for execution.
For example:
85