Switch Case in C Program

Switch Case in C Program

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  Switch Statement
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  Presented by: 1.Prapti Das ID:201120008 2.Rup Chowdhury ID: 201120010 3.Faiza Islam Orpa ID: 201120019 Notre Dame University Bangladesh
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  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
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  Switch Case  Switchcase 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.
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  Creating Menus If wewant 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.
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  SWITCH-SYNTAX If the expression matches value- 1,2 or 3 control jumps to Block- 1, 2 or 3 . Else the control will jump to default .
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  Switch Example
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  Switch-Default  A switchstatement 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
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  Switch with defaultcase example
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  To switch ornot 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
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  Why Use aswitch 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 .
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  Summary  Switch casestatement 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.
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  Thank You