#Sas interview questions code

To assign a value to a single macro variable, I can then use this macro variable in later steps. How we can call macros with in data step?ĬALL SYMPUT takes a value from a data step and assigns it to a macro variable.

#Sas interview questions code

How would you code a macro statement to produce information on the SAS log?ġ8. Macro parameters allow you to pass information into a macro.ġ7. How are parameters passed to a macro?Ī macro variable defined in parentheses in a %MACRO statement is a macro parameter. Yes, I can execute macro within a macro, we call it as nesting of macros, which is allowed.Įvery macro’s beginning is identified the keyword %macro and end with %mend.ġ6. Can you execute macro within another macro? If so, how would SAS know where the current macro ended and the new one began? This will assign “xyz” to x, not the variable xyz to x.ġ5. Use following statement to assign the value of a rather than the variable itself Simplest method is %LET.Ī, is macro variable. There are different ways of assigning a global variable. If we need a value of a macro variable then we must define it in such terms so that we can call them everywhere in the program. If you need the value of a variable rather than the variable itself what would you use to load the value to a macro variable?

They can be obtained by using symget and call symput macros.ġ4. Yes, Such macros are called nested macros. Can you execute a macro within a macro? Describe. Using %eval function or %sysevalf function if the number is a floating number.ġ3. How do you add a number to a macro variable? %PUT is used to display user defined messages on log window after execution of a program where as % SYMBOLGEN is used to print the value of a macro variable resolved, in log window.ġ2. What is the difference between %PUT and SYMBOLGEN? We create a macro with %MACRO statement and end a macro with %MEND statemnt.ġ1. What do you code to create a macro? End one? Other than that we can use the macro variable at any time.ġ0. The macro variable created by the CALL SYMPUT routine cannot be used in the same datastep in which it got created. If you use a SYMPUT in a DATA step, when and where can you use the macro variable? Then the compiler performs the syntax check on the statement.ĩ.The compiler then requests token until it receives a semicolon.Tokens are passed on demand to the compiler.How long can a macro variable be? A token?Ī component of SAS known as the word scanner breaks the program text into fundamental units called tokens. % Local is a macro variable defined inside a macro.%Global is a macro variable defined in open code (outside the macro or can use anywhere).Ĩ. What is the difference between %LOCAL and % GLOBAL ? Macros in SAS make a small change in the program and have SAS echo that change thought that program.ħ. Parameters passed to the macro program customize the results without having to change the code within the macro program. A macro program can be reused many times. We can accomplish repetitive tasks quickly and efficiently. If we want use a program step for executing to execute the same Proc step on multiple data sets. For what purposes have you used SAS macros? The end of the macro is defined by %Mend StatementĦ. How would you identify a macro variable?ĥ. How can you create a macro variable with in data step?Ĥ. Yes I have, I used macros in creating analysis datasets and tables where it is necessary to make a small change through out the program and where it is necessary to use the code again and again.Īfter I have defined a macro I can invoke it by adding the percent sign prefix to its name like this: % macro name a semicolon is not required when invoking a macro, though adding one generally does no harm.ģ. Have you used macros? For what purpose you have used? SAS Macros Interview Questions and Answers::ġ.