DO loop SAS programming?

SAS also supports a DO WHILE and DO UNTIL syntax that does not involve using a counter variable. It is worth noting that a DO loop with an UNTIL clause always executes at least one time because the condition is evaluated at the end of the loop. To prevent this behavior, use a DO loop with a WHILE clause.

What is DO loop with example?

The do while loop is an exit controlled loop, where even if the test condition is false, the loop body will be executed at least once. An example of such a scenario would be when you want to exit your program depending on the user input.

What is DO statement in SAS example?

You can use an IF-THEN-DO statement in SAS to do a block of statements if some condition is true. This statement uses the following basic syntax: if var1 = “value” then do; new_var2 = 10; new_var3 = 5; end; Note: An IF-THEN statement is used when you only want to do one statement.

DO WHILE and Do Until example in SAS?

The DO WHILE statement executes statements in a DO loop repetitively while a condition is true, checking the condition before each iteration of the DO loop. The DO UNTIL statement evaluates the condition at the bottom of the loop; the DO WHILE statement evaluates the condition at the top of the loop.

Do loops syntax?

The syntax for a do while statement is: do loop_body_statement while (cond_exp); where: loop_body_statement is any valid C statement or block….Any of the following C statements used as part of the loop_body_statement can alter the flow of control in a do while statement:

  • break.
  • continue.
  • goto.
  • return.

What is a do-while loop example in real life?

Real World Example, Go to the bath room: DO { Check_Door_Lock(); } WHILE (WAIT_WHILE_DOOR_IS_LOCKED()); after the loop is done then the WAIT_WHILE_DOOR_IS_LOCKED() has returned a false value, so it isn’t locked anymore, thus, the whole loop ends.

DO loops or arrays SAS?

Arrays list the variables that you want to perform the same operation on and can be specified with or without the number of elements/variables in the array. DO loops are used to specify the operation across the elements in the array.