Macro

String Reversal Macro and Variable Tests

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Difficulty Level
Beginner
Published on :
The code defines a macro named 'revrs' that uses an iterative loop to reverse the order of characters in an input string. It also defines a 'test' macro to provide an example string. The script then executes %PUT commands to display the result of the inversion as well as the concatenation of two global variables defined in the script.
Data Analysis

Type : CREATION_INTERNE

The script does not manipulate any SAS data tables. It operates solely on macro variables and character strings.

1 Code Block
MACRO DEFINITION
Explanation :
Definition of the 'revrs' macro. It iterates through the input string from end to beginning to build 'nstring'. Note: The presence of '&nstring' in the loop causes the variable to be displayed at each iteration.
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1%macro revrs(string);
2 %local nstring;
3 %DO i=%LENGTH(&string) %to 1 %BY -1;
4 %let nstring=&nstring%qsubstr(&string,&i,1);
5 &nstring
6 %END;
7 *&nstring;
8%mend revrs;
2 Code Block
MACRO DEFINITION
Explanation :
Definition of a utility macro 'test' that simply returns the string 'Two words'.
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1%macro test;
2 Two words
3%mend test;
3 Code Block
%PUT
Explanation :
Execution of the reversal macro on the result of the 'test' macro concatenated with itself, and display of the result in the log.
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1%put %nrstr(%test%test) - %revrs(%test%test);
4 Code Block
%LET / %PUT
Explanation :
Initialization of two global macro variables (wbh and ldh) and display of their direct concatenation.
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1%let wbh=A;
2%let ldh=B;
3 
4%put &wbh&ldh;
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