The document discusses looping statements in C. It explains that loops allow code to be repeated without having to rewrite the code multiple times. It describes three types of loops: while, do-while, and for. It provides the syntax and an example for each loop type. It also discusses the break and continue statements that can be used within loops to terminate the loop early or skip iterations.

1. Looping
statements in CPresented by,
S.Jeyalakshmi B.E.,
Sr.Lecturer/CE
MSPVL Polytechnic college, Pavoorchatram

2. Repetition

3. You Will Want to display HAI
More Than Once
HAI
HAI
HAI
HAI
HAI
HAI
HAI
HAI

4. You Could Code The ‘HAI’
Like This
printf("HAI");
printf(" HAI ");
printf(" HAI ");
printf(" HAI ");
printf(" HAI ");
printf(" HAI ");
printf(" HAI ");
printf(" HAI ");
No good programmer
does this!

5. Loop
• Don’t need to write this code 8 times.
• A loop is a piece of code which allows you to repeat
some code more than once without having to write it out
more than once.
printf("HAI ");

6. Looping statements
• Loops provide a way to repeat commands and control
how many times they are repeated.
• 3 types.
• while
• do-while
• for

7. while ( expression )
{
Single statement
or
Block of statements;
}
While
Syntax
7
Flow chart
If the test condition is true: the
statements get executed until the
condition becomes false.

8. While - Example
#include <stdio.h>
main()
{
int i = 0;
while ( i < 10 )
{
printf("Hello %dn", i );
i ++;
}
}
OUTPUT
Hello 0
Hello 1
Hello 2
Hello 3
Hello 4
Hello 5
Hello 6
Hello 7
Hello 8
Hello 9

9. do
{
Single statement
or
Block of statements;
}while ( expression )
Do While
Syntax
9
Flow chart
The statements get executed once.
Then the condition is evaluated. If the
test condition is true: until the
condition becomes false.

10. Do While - Example
#include <stdio.h>
main()
{
int i = 0;
do
{
printf("Hello %dn", i );
i ++;
} while ( i < 10 )
}
OUTPUT
Hello 0
Hello 1
Hello 2
Hello 3
Hello 4
Hello 5
Hello 6
Hello 7
Hello 8
Hello 9

11. for (initialization_expression;loop_condition;increment_expression)
{
// statements
}
)
for
Syntax
11
Flow chart

12. for- Example
#include <stdio.h>
main()
{
int i;
for( i = 0; i <10; i ++ )
{
printf("Hello %dn", i );
}
}
OUTPUT
Hello 0
Hello 1
Hello 2
Hello 3
Hello 4
Hello 5
Hello 6
Hello 7
Hello 8
Hello 9

13. Break
• It is used in terminating the loop immediately after it is
encountered.
• It can be used inside a switch, for loop, while loop and
do-while loop.

14. Break- Example
#include <stdio.h>
main()
{
int i;
for( i = 0; i <10; i ++ )
{
printf("Hello %dn", i );
if(i==4)
break;
}
}
OUTPUT
Hello 0
Hello 1
Hello 2
Hello 3
Hello 4

15. Continue
• It is sometimes desirable to skip some statements inside
the loop.
• In such cases, continue statements are used.

16. Continue - Example
#include <stdio.h>
main()
{
int i;
for( i = 0; i <10; i ++ )
{
printf("Hello %dt", i );
if(i==4)
continue;
printf(“Welcomen”);
}
}
OUTPUT
Hello 0 Welcome
Hello 1 Welcome
Hello 2 Welcome
Hello 3 Welcome
Hello 4
Hello 5 Welcome
Hello 6 Welcome
Hello 7 Welcome
Hello 8 Welcome
Hello 9 Welcome