Looping statements in C

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

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

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!

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 ");

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

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.

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

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.

Do While - Example
#include <stdio.h>
main()
{
int i = 0;
do
{
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

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

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

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.

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

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

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

Looping statements in C

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