Language Reference |
DO Statement with a WHILE Clause |
The DO WHILE statement executes statements iteratively while a condition is true.
The arguments to the DO WHILE statement are as follows:
is an expression that is evaluated at the top of the loop for being true or false.
is the name of a variable that indexes the loop.
is the starting value for the looping variable.
is the stopping value for the looping variable.
is an increment value.
Using a WHILE expression enables you to conditionally execute a set of statements iteratively. The WHILE expression is evaluated at the top of the loop, and the statements inside the loop are executed repeatedly as long as the expression yields a nonzero or nonmissing value.
Note that the incrementing is done before the WHILE expression is tested. The following example demonstrates the incrementing:
x = 1; do while (x<100); x = x + 1; end; print x;
The next example increments the starting value by 2:
y = 1; do i = 1 to 100 by 2 while(y<200); y = y # i; end; print i y;
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