1. Topics discussed in this section:
6-5 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.
Topics discussed in this section:
The while Loop
The for Loop
The do…while Loop
The Comma Expression
Computer Science: A Structured Programming Approach Using C

2. FIGURE 6-9 C Loop Constructs
Computer Science: A Structured Programming Approach Using C

3. FIGURE 6-10 The while Statement
Computer Science: A Structured Programming Approach Using C

4. FIGURE 6-11 Compound while Statement
Computer Science: A Structured Programming Approach Using C

5. Process-control System Example
PROGRAM 6-1
Process-control System Example
Computer Science: A Structured Programming Approach Using C

6. A while Loop to Print Numbers
PROGRAM 6-2
A while Loop to Print Numbers
Computer Science: A Structured Programming Approach Using C

7. A while Loop to Print Numbers
PROGRAM 6-2
A while Loop to Print Numbers
Computer Science: A Structured Programming Approach Using C

8. Adding a List of Numbers
PROGRAM 6-3
Adding a List of Numbers
Computer Science: A Structured Programming Approach Using C

9. Adding a List of Numbers
PROGRAM 6-3
Adding a List of Numbers
Computer Science: A Structured Programming Approach Using C

10. more natural for counting loops.
Note
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.
Computer Science: A Structured Programming Approach Using C

11. FIGURE 6-14 Comparing for and while Loops
Computer Science: A Structured Programming Approach Using C

12. PROGRAM 6-4 Example of a for Loop
Computer Science: A Structured Programming Approach Using C

13. PROGRAM 6-4 Example of a for Loop
Computer Science: A Structured Programming Approach Using C

14. A Simple Nested for Loop
PROGRAM 6-5
A Simple Nested for Loop
Computer Science: A Structured Programming Approach Using C

15. A Simple Nested for Loop
PROGRAM 6-5
A Simple Nested for Loop
Computer Science: A Structured Programming Approach Using C

16. FIGURE 6-15 do…while Statement
Computer Science: A Structured Programming Approach Using C

17. PROGRAM 6-6 Two Simple Loops
Computer Science: A Structured Programming Approach Using C

18. PROGRAM 6-6 Two Simple Loops
Computer Science: A Structured Programming Approach Using C

19. FIGURE 6-16 Pre- and Post-test Loops
Computer Science: A Structured Programming Approach Using C

20. Adding a List with the do…while
PROGRAM 6-7
Adding a List with the do…while
Computer Science: A Structured Programming Approach Using C

21. Adding a List with the do…while
PROGRAM 6-7
Adding a List with the do…while
Computer Science: A Structured Programming Approach Using C

22. FIGURE 6-17 Nested Comma Expression
Computer Science: A Structured Programming Approach Using C

23. Comparison of while and do…while
PROGRAM 6-8
Comparison of while and do…while
Computer Science: A Structured Programming Approach Using C

24. Comparison of while and do…while
PROGRAM 6-8
Comparison of while and do…while
Computer Science: A Structured Programming Approach Using C