What is do while syntax in SAS?

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

Do Until vs do while 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.

What is do while in SAS macro?

The %DO %WHILE statement tests the condition at the top of the loop. If the condition is false the first time the macro processor tests it, the %DO %WHILE loop does not iterate.

Do while and do until examples in SAS?

Do While Loop vs Do Until Explained in SAS

• Do Until Executes at Least Once. A fundamental difference between the Do While and Do Until is this:
• Do While Evaluates at the Top, Do Until Evaluates at the Bottom.
• Do While Executes When Condition is True, Do Until Executes When Condition is False.

How to do a DO WHILE loop in SAS?

This DO WHILE loop uses a WHILE condition. The SAS statements are repeatedly executed until the while condition becomes false. DO WHILE (variable condition); . . . SAS statements . . . ; END;

When to use a while condition in SAS?

This DO WHILE loop uses a WHILE condition. The SAS statements are repeatedly executed until the while condition becomes false. DO WHILE (variable condition); . . .

What is the syntax for the DO statement in SAS?

The basic iterative DO statement in SAS has the syntax DO value = start TO stop. By default, each iteration of a DO statement increments the value of the counter by 1, but you can use the BY option to increment the counter by other amounts, including non-integer amounts.

When to use the iterative do statement in SAS?

When i=4, the WHILE condition is not satisfied, so the loop iterates again. You can use the iterative DO statement with an UNTIL clause to iterate until a condition becomes true. The UNTIL condition is evaluated at the end of the loop, so you do not have to initialize the condition prior to the loop.