C has three loop statements: while, for, and do...while. The while and for are pretest loops where the condition is checked before the loop body executes, and do...while is a post-test loop where the condition is checked after the body executes. All three loops can be used for event-controlled and counter-controlled loops.

1. Loops in C
C has three loop statements: the while, the for, and the
do…while. The first two are pretest loops, and the
the third is a post-test loop. We can use all of them
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:

2. C Loop Constructs

3. The while Statement

4. Compound while Statement

5. Process-control System Example

6. A while Loop to Print Numbers

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

8. PROGRAM 6-3 Adding a List of Numbers

9. PROGRAM 6-3 Adding a List of Numbers

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

11. Comparing for and while Loops

12. PROGRAM 6-4 Example of a for Loop

13. PROGRAM 6-4 Example of a for Loop

14. PROGRAM 6-5 A Simple Nested for Loop

15. PROGRAM 6-5 A Simple Nested for Loop

16. do…while Statement

17. PROGRAM 6-6 Two Simple Loops

18. PROGRAM 6-6 Two Simple Loops

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

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

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

22. Nested Comma Expression

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

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