do-while loops

As we have seen with the while loop, the boolean loop continuation expression is at the start of the loop. Though similar to the while loop, the do-while loop is different in one critical aspect: in the do-while loop, the loop continuation expression is at the end of the loop. Thus, the do-while loop is executed at least once. More formally, a do-while loop executes one or more times.

Figure 5.4 presents the syntax of the do-while loop.

Figure 5.4 – The do-while loop syntax

As can be seen in the preceding figure, the loop continuation expression is at the end of the loop, after one loop iteration. Also note the semi-colon, ; after ).

Figure 5.5 presents a do-while version of the while loop in Figure 5.2.

Figure 5.5 – A do-while loop that ends based on user input

In the preceding figure, the only differences with Figure 5.2 are lines 21 and 30. On line 21, we simply enter the loop as, unlike...