### A good answer might be:

Yes. It is regarded as if-then-else with an empty else-branch.

# Structure Rule Four: Iteration

If iteration (while-loop) is arranged as at right, it also has one entry point and one exit point. The entry point has conditions that must be satisfied and the exit point has conditions that will be fulfilled. There are no jumps into the structure from external points of the code.

> Rule 4 of Structured Programming: The iteration of a code block is structured.

As with the other structures, iteration is built out of assembly language pieces. There are various ways to do it. The following is typical

    while:  bltz   $8,endWh

            . . .

            j      while
            sll    $0,$0,0

    endWh:  sll    $0,$0,0

The particular instructions that make up the test depend on circumstances.

### QUESTION 16:

In a structured language (such as Pascal, C, or Java) can an alternation structure be put inside an iteration structure? (can the body of a while-loop contain an if-then-else?)