Switch Case Operations

Today I want to write about switch-case statement in c. This statement is a totaly saver in some situation. However, It has a tricky point and before using that you should learn that tricky point.

I want to explain it with an example code :

#include <stdio.h>                                 
                                                   
main()                                             
{                                                  
     int  Grade = 'A';                             
                                                   
     switch( Grade )                               
     {                                             
        case 'A' : printf( "Perfect\n" );          
        case 'B' : printf( "Good\n" );             
        case 'C' : printf( "OK\n" );               
        case 'D' : printf( "Danger\n" );           
        case 'F' : printf( "Problem\n" );          
        default  : printf( "You Did a Mistake\n" );
     }                                             
}                                                  

if we write the program like this , our output will become like this.

Perfect          
Good             
OK               
Danger           
Problem          
You Did a Mistake

So we should use break statement between two cases to solve the 

problem.

#include <stdio.h>                                 
                                                   
main()                                             
{                                                  
     int  Grade = 'A';                             
                                                   
     switch( Grade )                               
     {                                             
        case 'A' : printf( "Perfect\n" );          
                   break;                          
        case 'B' : printf( "Good\n" );             
                   break;                          
        case 'C' : printf( "OK\n" );               
                   break;                          
        case 'D' : printf( "Danger\n" );           
                   break;                          
        case 'F' : printf( "Problem\n" );          
                   break;                          
        default  : printf( "You Did a Mistake\n" );
                   break;                          
     }                                             
}                                                  

This time our output will become

Perfect

Break point is very important while using the swich-case statement.

Default cases do the same work as else.