Macro-Variable Manipulation and Arithmetic Operations

This script illustrates the fundamental concepts of the SAS^© macro language: text assignment, the distinction between literal text and calculation, the use of %EVAL for integers and %SYSEVALF for floating-point numbers, as well as handling null variables.

Data Analysis

Type : CREATION_INTERNE

The script does not manipulate any SAS data tables (dataset). It acts only on the in-memory macro symbol table.

1 Code Block

MACRO STATEMENT

Explanation :
Creation of a macro-variable containing a character string and display of its resolved value in the log.

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1	%LET myName = FirstName LastName;
2	%PUT Hello World! My name is &myName;
3

2 Code Block

MACRO STATEMENT

Explanation :
Definition of variables. Without an explicit evaluation function, '77 + 92' is treated as a literal text string and not as a mathematical operation.

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1	/* a few more examples of variables */
2	%Let age = 70;
3	%Let twograde = 77 + 92;
4	%Put &twograde

3 Code Block

MACRO STATEMENT

Explanation :
Using the %EVAL function to force the evaluation of an integer arithmetic expression.

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1	%Let totgrade = %eval(77+92)
2	%Put &totgrade

4 Code Block

MACRO STATEMENT

Explanation :
Using the %SYSEVALF function to evaluate arithmetic expressions containing decimal (floating-point) numbers.

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1	%Let totprice = %sysevalf(77.5+92.1)
2	%Put &totprice

5 Code Block

MACRO STATEMENT

Explanation :
Initialization of a macro-variable with a null value (empty string).

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1	%Let state=;
2	%Put &state;

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