Switch Case in C Program

This slide is about switch case statement in C program. This statement is very useful when we have run different parts of the program by user's choice.

1. Switch Statement

2. Presented by: 1. Prapti Das ID: 201120008 2.Rup Chowdhury ID: 201120010 3.Faiza Islam Orpa ID: 201120019 Notre Dame University Bangladesh

3. Outlines Switch Case Flow Chart of Switch Case Creating Menus Switch – syntax Switch Example Switch Default To Switch or not To Switch Uses of Switch Case Summary

4. Switch Case Switch case statement allows us to make decisions from multiple choices. Integer expression must hold integer values like 1,2,3 etc. The keyword case is followed by an integer or a character constant. Each constant in each case must be different from others. Break statement can be used to terminate a statement sequence. When a break statement is encountered the loop is immediately terminated and compilation resumes at the next statement following the loop. Default case can be used for performing a task when none of the cases is true. No break is needed in the Default case.

5. Flow Chart of Switch Case

6. Creating Menus If we want to give user a choice on what to do next, we can display a set of options. Then the user can enter his/her choice . A notice should be given so that the user can understand which type of input to enter.

7. Switch-Syntax If th e expression matches value-1, 2 or 3 control jumps to Block-1, 2 or 3 . Else the control will jump to default .

8. Switch Example

9. Switch-Default A switch statement can have an optional default case The default case has no associated value and simply uses the reserved word default If the default case is present, control will transfer to it if no other case value matches If there is no default case and no other value matches, control falls through to the statement after the switch

10. Switch with default case example

11. To switch or not To switch The expression of switch statement must result in an Integral type, meaning an integer(byte, short, int, long) or a char It cannot be a Boolean value or a floating point value (float or double) The implicit Boolean condition in a switch statement is equality You cannot perform relational checks with a switch statement

12. Why Use a switch case? A nested if-else structure is just as efficient as a switch case . However, a switch case may be easier to read. Also, it is easier to add new cases to a switch case than to a nested if-else structure .

13. Summary Switch case statement can be used to create options in a program . It allows a variable to be tested for equality against a list of values. Each value is called a case. The break statement can be used as the last statement in each case’s statement list A break statement causes control to transfer to the end of the switch statement. If a break statement is not used, the flow of control will continue into the next case.

14. Thank You