2. 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

3. If, Loop and Switch
Jithin Mathew
jitmat@gmail.com
www.facebook.com/jithinmatthew

4. Control Statement
• Used in the C language to make decisions and
control the flow of the program.
• It decide the flow of a program.

5. They are decision making statements
• If statement
• If-else statement
• Switch case

6. If Statements
Syntax:
if (condition)
{
statement(s);
}

8. #include <stdio.h>
int main()
{
int num;
printf("Enter a number to check.n");
scanf("%d",&num);
if(num>5)
printf("numbur greater than 5");
return 0;
}

10. If statement cont..
• Adding a semicolon at the end of an if
clause is a common mistake.
• This mistake is hard to find, because it is
not a compilation error or a runtime error, it
is a logic error.

11. if…else Statement
Syntax:
if(condition)
{ true statements;
}
else
{
false statements;
}

12. Flow chart:

13. if...else Example
#include <stdio.h>
main()
{
int no;
printf("n Enter Number :");
scanf("%d",&no);
if(no%2==0)
printf("Number is even !");
else
printf("nn Number is odd !");
return 0;
}

15. switch Statement
• This is a multiple or multiway brancing
decision making statement.
• Similar to if statements
• Can list any number of branches
• Used in place of nested if statements
• Avoids confusion of deeply nested ifs
• Easy to find out errors.

17. Switch flowchart
entry
Expression?
value1 value2 value3 value4 Value n
Statement(s) Statement(s) Statement(s) Statement(s) Statement(s)

18. #include <stdio.h>
main()
{
int no;
printf("Enter any number from 1 to 3 :");
scanf("%d",&no);
switch(no)
{
case 1:
printf("It is 1 !");
break;
case 2:
printf("It is 2 !");
break;
case 3:
printf("It is 3 !");
break;
default:
printf("Invalid number !");
}
getch();
}

20. Looping statement
• It uses an expression that evaluates to either
TRUE or FALSE
• Used to determine when an action should be
repeatedly performed in a program.
1. do loop
2. while loop
3. for loop statements.

21. while Loop
It repeatedly executes a target statement as long as a
given condition is true.
Syntax:
while(condition)
{
statements;
}

22. Flow chart

23. #include <stdio.h>
int main ()
{
/* local variable definition */
int a = 10;
/* while loop execution */
while( a < 20 )
{
printf("value of a: %dn", a);
a++;
}
return 0;
}

25. do-while Loop
Syntax;
do {
statements
}
while (condition);

27. #include <stdio.h>
int main ()
{
/* local variable definition */
int a = 10;
/* do loop execution */
do
{
printf("value of a: %dn", a);
a = a + 1;
}
while( a < 20 );
return 0;
}

29. For Loop
• It is a repetition control structure that allows
you to efficiently write a loop that needs to
execute a specific number of times.
• Easy to use
• Highly flexible
• More than one variable can be initilized.
• More than one increments can be applied.

30. Syntax:
for ( init; condition; increment )
{
statement(s);
}

31. Flow chart:

32. for Loop Example
#include <stdio.h>
int main()
{
int a;
for (a=0; a<5; a++)
{
printf("Baabtran");
}
return 0;
}

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