Switch case in C

Question

Can someone help with the below

#include <stdio.h>

main ()
{
    char receive_buff [] ={0x01,0x00,0x01,0x01,0x00,0x00};

    switch( receive_buff[0] ) 
    {
        case 0x00:
            {printf("\nswitch 00\n");}
        case 0x01:
            {printf("\nswitch 01\n");}
        case 0x02:
            {printf("\nswitch 02\n");}
        default :
            {printf("\nswitch default\n");}
    }
}

the result is

 ./a.out 

switch 01
Ro
switch 02

switch default

I don't know what going on here.

main () should be int main(void)

Keith Thompson
– Keith Thompson

2012-01-21 23:09:43 +00:00
Commented Jan 21, 2012 at 23:09 — Keith Thompson
– Keith Thompson, Commented Jan 21, 2012 at 23:09
Could You explain what is Ro?

TrueY
– TrueY

2013-05-06 14:17:30 +00:00
Commented May 6, 2013 at 14:17 — TrueY
– TrueY, Commented May 6, 2013 at 14:17

Winston Ewert · Accepted Answer · 2012-01-21 21:56:34Z

6

switch( receive_buff[0] ) 
{
    case 0x00:
        {printf("\nswitch 00\n");}
    case 0x01:
        {printf("\nswitch 01\n");}
    case 0x02:
        {printf("\nswitch 02\n");}

    default :
        {printf("\nswitch defualt\n");}
}

Should be

switch( receive_buff[0] ) 
{
    case 0x00:
        {printf("\nswitch 00\n");}
        break;
    case 0x01:
        {printf("\nswitch 01\n");}
        break;
    case 0x02:
        {printf("\nswitch 02\n");}
        break;
    default :
        {printf("\nswitch defualt\n");}
        break;
}

answered Jan 21, 2012 at 21:56

Winston Ewert

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Comments

Daniel Pittman · Accepted Answer · 2012-01-21 21:56:16Z

5

You need a break statement after each set of actions, or the C switch will fall through. See http://en.wikipedia.org/wiki/Switch_statement#C.2C_C.2B.2B.2C_D.2C_Java.2C_PHP.2C_ActionScript.2C_JavaScript

answered Jan 21, 2012 at 21:56

Daniel Pittman

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