2. Arun .R. Menon
arunrmenon555@gmail.com
www.facebook.com/arunrmenon
twitter.com/iamarunmenon
in.linkedin.com/in/mearunmenon
+919846629020
Control Structures in C

3. Disclaimer: This presentation is prepared by trainees of
baabtra as a part of mentoring program. This is not official
document of baabtra –Mentoring Partner
Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd

4. Control Structures
• System working
• Why control structures ?
• What is control Structures?

5. Styles of Control Structures in C
• Branching
• Looping

6. Branching
• What is Branching ?
• if statements
• ? : Operator
• switch statement

7. if statements
• If
• if (expression)
statement;
or
• if (expression)
{
Block of statements;
}

8. • If ……..else
if (expression)
{ Block of statements; }
else
{ Block of statements; }
• else if
if (expression)
{ Block of statements; }
else if(expression)
{ Block of statements; }

9. #include <stdio.h>
main() {
int cows = 6;
if (cows > 1)
printf("We have cowsn");
if (cows > 10)
printf("loads of them!n");
else
printf("Executing else part...!n");
if (cows == 5 )
{
printf("We have 5 cowsn");
}
else if( (cows == 6 )
{
printf("We have 6 cowsn");
}
We have cows
Executing else part...!
We have 6 cows

10. ? : Operator
• Similar to if
• ternary operator
Eg
#include <stdio.h>
main()
{
int a , b;
a = 10;
printf( "Value of b is %dn", (a == 1) ? 20: 30 );
printf( "Value of b is %dn", (a == 10) ? 20: 30 );
}
Value of b is 30
Value of b is 20

11. switch statement
#include <stdio.h>
main()
{
int Grade = ‘ ’;
switch( Grade )
{
case 'A' : printf( "Excellentn" ); break;
case 'B' : printf( "Goodn" ); break;
case 'C' : printf( "OKn" ); break;
case 'D' : printf( "Mmmmm....n" ); break;
case 'F' : printf( "You must do better than thisn" ); break;
default : printf( "What is your grade anyway?n" ); break;
}
}
A
Excellent
B C D F def
Good
Ok
Mmmm
You must do ..
What is your

12. Looping
• What is looping
• for
• while
• dowhile

13. for loop
#include <stdio.h>
main()
{
int i;
for( i = 0; i <= j; i ++ )
{
printf("Hello %dn", i );
if( i == 6 )
{ break; }
}
}
Hello 0
Hello 1
Hello 2
Hello 3
Hello 4
Hello 5
Hello 6

14. while
#include <stdio.h>
main()
{
int i = 0;
while ( i < 5 )
{
if(i==4)
continue;
printf("Hello %dn", i );
i = i -1;
}
}
Hello 0
Hello 1
Hello 2
Hello 5

15. do while
#include <stdio.h>
main()
{
int i = 10;
do{
printf("Hello %dn", i );
i = i -1;
if( i == 6 ) { break; }
}
while ( i > 0 );
}
Hello 10
Hello 9
Hello 8
Hello 7
Hello 6

16. #include <stdio.h>
main()
{
int i = 1;
do{
printf("Hello %dn", i );
i = i -1;
if( i == 6 ) { break; }
}
while ( i > 5 );
}
Hello 1

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