The document outlines the three loop constructs in C: while, for, and do...while, explaining their uses as pretest and post-test loops for event-controlled and counter-controlled operations. It includes figures and programs demonstrating these loop types, such as examples of counting and adding numbers. The comparison of loop constructs is emphasized, with notes on readability and execution in specific scenarios.

1. 1
6-5 Loops in C
C has three loop statements: the
C has three loop statements: the while
while, the
, the for
for, and the
, and the
do…while
do…while. The first two are pretest loops, and the
. The first two are pretest loops, and the
the third is a post-test loop. We can use all of them
the third is a post-test loop. We can use all of them
for event-controlled and counter-controlled loops.
for event-controlled and counter-controlled loops.
The while Loop
The for Loop
The do…while Loop
The Comma Expression
Topics discussed in this section:
Topics discussed in this section:

2. 2
FIGURE 6-9 C Loop Constructs

3. 3
FIGURE 6-10 The while Statement

4. 4
FIGURE 6-11 Compound while Statement

5. 5
PROGRAM 6-1 Process-control System Example

6. 6
PROGRAM 6-2 A while Loop to Print Numbers

7. 7
PROGRAM 6-2 A while Loop to Print Numbers

8. 8
PROGRAM 6-3 Adding a List of Numbers

9. 9
PROGRAM 6-3 Adding a List of Numbers

10. 10
A for loop is used when a loop is to be executed a known
number of times. We can do the same thing with a while
loop, but the for loop is easier to read and
more natural for counting loops.
Note
Note

11. 11
FIGURE 6-14 Comparing for and while Loops

12. 12
PROGRAM 6-4 Example of a for Loop

13. 13
PROGRAM 6-4 Example of a for Loop

14. 14
PROGRAM 6-5 A Simple Nested for Loop

15. 15
PROGRAM 6-5 A Simple Nested for Loop

16. 16
FIGURE 6-15 do…while Statement

17. 17
PROGRAM 6-6 Two Simple Loops

18. 18
PROGRAM 6-6 Two Simple Loops

19. 19
FIGURE 6-16 Pre- and Post-test Loops

20. 20
PROGRAM 6-7 Adding a List with the do…while

21. 21
PROGRAM 6-7 Adding a List with the do…while

22. 22
FIGURE 6-17 Nested Comma Expression

23. 23
PROGRAM 6-8 Comparison of while and do…while

24. 24
PROGRAM 6-8 Comparison of while and do…while