Control statement in c

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3. Control
statement in
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4. • C provides two sytles of flow
control:
• Branching
• Looping

5. If statement
• It takes an expression in parenthesis and an
statement or block of statements. if the
expression is true then the statement or block
of statements gets executed otherwise these
statements are skipped.

6. If(test expression)
Statement;
Or
If (test expression)
{
Block of statements1;
}
Else
{
Statement2;
}

7. Switch statement
• A switch statement allows a variable to be
tested for equality against a list of values. Each
value is called a case, and the variable being
switched on is checked for each switch case.

8. Switch( expression)
{
case 1
Statement 1
Break;
}
Case2
Statement 2
Break;
}

9. • Depending on the position of control
statement in c,control structure may be
classified
• Entry_ controlled loop
• Exit _controlled loop

10. False
true
Entry controlled loop exit controlled loop
Test
conditio
n ?
Body of the
loop
Body of the
loop
Test
conditio
n ?

11. • C language provides three constructs for
perfoming loop operations
• While statement
• Do statements
• For statements

12. While(test condition)
{
body of the loop
}

13. ………………………
………………………
int_sum=0;
int_n=1;
while(int_n<=10)
{
int_sum=int_sum+int_n;
int_n=int_n+1;
}
printf(“sum=%dn”,int_sum);
…………………………………………..

14. Do statement
do
{
Body of the loop
}
While(test condition)

15. int_i=1;
int_sum=0;
do
{
int_sum=int_sum+I
i=i+2;
}
while(sum<40||i<10);
printf(“%d %dn,I,sum);

16. For statements
For(intialization;testcondition;icrement)
{
body of the loop
}

17. • Intialization of control variable done
first using assignment statement
• The value of control variable tested
using test condition,ie reletional
expression such as i>10,that determine
when the loop will exit
• If the condition is true ,the body of
loop executed,otherwise terminated

18. int_sum=0;
for(int_n=1;int_n<=10;int_n++)
{
int_sum=int_sum+int_n;
}
printf(“sum=%dn”,int_sum);

19. additional features of for loop
1. More than one variable can be intialized atb a time
2. More than one variable incremented at a time
3. The thest condition may have compound relation
4. One or more sections can be omitted ,if necessary
eg:
m=5;
for(;m!=100;)
{
printf(“%dn”,m)
m=m+5;
}

20. Nesting of for loop
For(i=0;i<n;i++)
{
………………………………
For(j=0;j<n-1;j++)
{
………………………………
}
}

21. Jumping out of a loop
• Exit from a loop using break statement
if a break statement encounteredd in a
loop,the loop will immidiatly exited and the
program continues with the statement
immidiatly following loop;ie break will exit
only a single loop

22. Eg:
while(test condition)
{
……………………………..
………………………………
if(condition)
break;

23. Skipping a part of loop
Another statement ‘continue’,
• It tells the compiler skip the following statements
and continue with next iteration
Eg:
While (test condition)
{
………………………..
If(…………)
Continue;

24. ???

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