SAS Macro Language: Reference

Introduction

There are three types of macro expressions: text, logical, and arithmetic. A text expression is any combination of text, macro variables, macro functions, or macro calls. Text expressions are resolved to generate text. Here are some examples of text expressions:

&BEGIN
%GETLINE
&PREFIX.PART&SUFFIX
%UPCASE(&ANSWER)

A logical expression or an arithmetic expression is a sequence of operators and operands forming a set of instructions that are evaluated to produce a result. An arithmetic expression contains an arithmetic operator. A logical expression contains a logical operator. The following table show examples of simple arithmetic and logical expressions:

Arithmetic Expressions Logical expressions

1 + 2 &DAY = FRIDAY

4 * 3 A < a

4 / 2 1 < &INDEX

00FFx - 003Ax &START NE &END

Arithmetic Expressions	Logical expressions
1 + 2	&DAY = FRIDAY
4 * 3	A < a
4 / 2	1 < &INDEX
00FFx - 003Ax	&START NE &END

The following sections tell you where and how to use arithmetic and logical expressions in macro functions and statements.

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