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 Not every case needs to contain a break. If no break appears, the flow of
control will fall through to subsequent cases until a break is reached.
 A switch statement can have an optional default case, which must appear
at the end of the switch. The default case can be used for performing a task when none of the
cases is true. No break is needed in the default case.

Flow Diagram

Example

#include <stdio.h>

int main ()

{
/* local variable definition */
char grade = 'B';

switch(grade)
{
case 'A' :

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