1. Chapter 5: Selection Statement

2. Selection Statement: Definition
A selection statement causes the program control to be transferred to a specific flow based upon whether a certain condition is true or not.

3. Logical Expression if statement must test the value of an expression
Relation operator is used along with if
A=10; B=20;

4. The if statement
If statement allows a program to choose two alternatives by testing the value if a expression
Syntax:
if (expression)
statement;
Eg:
a=10;
b=20;
if(a>b)
printf(“A is greater than b”);
if(b>a)
printf(“ B is greater than a”);
if(a==b)
printf(“A and B are equal”);

5. The if statement contd…
For compound statement used braces
Syntax:
if (expression) {
statement1;
Statement2;
Statement3;
….;
…..;
……; }

6. The else Clause An if statement may have an else clause
Syntax: if(expression)
statement;
else
Example:
if(i>j)
max=i;
max=j;

7. Nested if
if statement inside if is called nested if
Example:

8. Cascaded if
We often need series of test condition stopping them when one is true

9. Logical Operator
An operator that acts on binary value to produce a result according to the laws of Boolean logic (e.g. the AND, OR, and NOT functions).
Logical operator reduces Lines of Code in selection statement
If A holds 1 and B holds 0 then,

10. Logical Operator Example #1

11. Logical Operator Example #2

12. Logical Operator Example #3

13. Conditional Operator Conditional operator use two symbols ? and :
Syntax: expression1 ? Expression2 : expression3
Unique C operator, needs three operands (ternary operator)
Read as if expression1 then expression2 else expression3

14. Conditional Operator Example#1

15. Conditional Operator Example#2

16. Conditional Operator Example3

17. The Switch Statement Switch the statement according to case
Better that using cascading if

18. Syntax

19. The Switch Statement Example