TOPS-20 PASCAL Language Manual - Bitsavers

CHAPTER 3
EXPRESSIONS
An expression is a symbol or group of symbols that PASCAL can
evaluate. These symbols can be constants, variables, or functions, or
any combination of constants, variables, and functions, combined with
operators. The simplest expression is a single variable or constant.
This chapter lists the various operators that PASCAL provides along
with the rules for forming arithmetic, relational, logical, and set
expressions.
3.1 OPERATORS
PASCAL provides the following types of operators:
• Arithmetic operators (such as +, - /)
• Relational operators (such as , =)
• Logical operators (such as AND, OR, NOT)
• Set operators (such as IN)
3.1.1 ArithmetIc Expressions
An arithmetic expression usually provides a formula for calculating a
value. To construct an arithmetic expression, you combine numeric
constants, variables, and function identifiers with one or more of the
operators from Table 3-1.
3-1