Discover about looping structures in C language

1. LOOPING STRUCTURES

2. LOOPS
Entry Controlled
Loop
Exit Controlled
Loop

3. ENTRY CONTROLLED
LOOPS

4. EXIT CONTROLLED
LOOPS

5. Entry controlled
Test condition appears at the
beginning.
Control variable is counter
variable.
Each execution occurs by
testing condition.
Eg:
sum = 0;
n = 1;
while (n <= 10)
{
sum = sum + n*n;
n = n+ 1;
}
Exit controlled
Test condition appears at the end.
Control variable is counter &
sentinel variable.
Each execution except the first
one occurs by testing condition.
Eg:
do
{
printf(“Input a number.n”);
scanf("%d", &num);
}
while(num>0);

6. ENTRYCONTROLLED
LOOPS
for Statement
while
Statement

7. for STATEMENT

8. for STATEMENT

9. while STATEMENT

10. while STATEMENT

11. EXITCONTROLLED
LOOPS
do….while
Statement

12. do…while STATEMENT
Do while has a loop condition only that is tested
after each iteration to decide whether to continue
with next iteration or terminate the loop.

13. EXAMPLES(quicktime player reqd)