Presentation on Loop(C Language) by Dheemaan Daash

1. Presentation on
LOOP
Presented By
Dheemaan Daash
Department of CSE
Metropolitan University
ID Number: 181-115-002

2.  Loop Statement are used to repeat
the execution of statement or
blocks.
 Two types of loop structure are:
 Pretest
 Posttest

3. Pretest versus Postest
 Pretest: Condition is tested before each iteration to
check if loop should occur.
Example: For and While Loop
 Posttest: Condition is tested after each iteration to
check if loop should occur.
Example: Do-While Loop

4. For Loop
For Loop has three parts:
 Initializer is executed at start of loop.
 Loop condition is tested before iteration to decide
whether to continue or terminate the loop.
 Increment is executed at the end of each loop
iteration.

5. Syntax:
for( [initializor]; [condition]; [incrementor] )
<statement/block>;
Example: for(i=0; i<3; i++)
printf(“Hellon”);
Output:
Hello
Hello
Hello

6. While Loop
 It has a loop condition only that is tested before
each iteration to decide whether to continue or
terminated the loop.
Syntax:
while(<condition>)
<statement/block>;

7. Example:
while(i=0;i<3;i++)
printf(“Hellon”);
Output:
Hello
Hello
Hello

8. Do-While Loop
 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.
Syntax:
do
<statement/block>;
while(condition);

9. Example:
Do {
printf(“Hellon”);
} while(i<3)
Output:
Hello
Hello
Hello