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Old 08-24-2005, 05:55 AM   #1
alaios
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Registered: Jan 2003
Location: Aachen
Distribution: Opensuse 11.2 (nice and steady)
Posts: 2,203

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problematic case statement


Plz take a look to the following code



printf("snmp_fetch_oid_value: To response->errstat einai %ld \n",response->errstat);
switch(response->errstat){
case (SNMP_ERR_TOOBIG):
printf("Too big messange \n");
case (SNMP_ERR_NOSUCHNAME):
printf("No such name idiot \n");
case (SNMP_ERR_BADVALUE):
printf("Bad value \n");
case (SNMP_ERR_READONLY):
printf("Read only value \n");
case (SNMP_ERR_GENERR):
printf("Generic error \n");
default:
printf("Everything is fine \n");
}



After the execution i take the following message....
It seems that case checks all the statements

after execution:

snmp_fetch_oid_value: To response->errstat einai 2
No such name idiot
Bad value
Read only value
Generic error
Everything is fine
 
Old 08-24-2005, 06:24 AM   #2
sind
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Registered: Jun 2005
Posts: 75

Rep: Reputation: 15
You need to put a break statement after each case block, so that the compiler knows to exit the switch block. Otherwise, execution will "fall" through all of the remaining case blocks to the end of the switch block.

Code:
printf("snmp_fetch_oid_value: To response->errstat einai %ld \n",response->errstat);

switch(response->errstat)
{
    case (SNMP_ERR_TOOBIG):
        printf("Too big messange \n");
        break;

    case (SNMP_ERR_NOSUCHNAME):
        printf("No such name idiot \n");
        break;

    case (SNMP_ERR_BADVALUE):
        printf("Bad value \n");
        break;

    case (SNMP_ERR_READONLY):
        printf("Read only value \n");
        break;

    case (SNMP_ERR_GENERR):
        printf("Generic error \n");
        break;

    default:
        printf("Everything is fine \n");
}
~sind
 
Old 08-24-2005, 08:16 AM   #3
alaios
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Registered: Jan 2003
Location: Aachen
Distribution: Opensuse 11.2 (nice and steady)
Posts: 2,203

Original Poster
Rep: Reputation: 45
Thaths my problem.. b ut i can really understand why the break is necessary...... All the case statements are not valid... The mystery is not why the execution falls to every category but why every statement seems to be true....
Thx for your time
 
Old 08-24-2005, 08:56 AM   #4
mic
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Registered: Jun 2005
Posts: 44

Rep: Reputation: 16
It's like sind told you, but maybe you didn't completely understand what he was trying to say.

The condition with SNMP_ERR_NOSUCHNAME is true, others may not be true. However, all statements after finding "true" in the switch block get executed. Unless you put "break;"

Try the sind's code, you'll see it works as it should.
 
Old 08-24-2005, 09:05 AM   #5
alaios
Senior Member
 
Registered: Jan 2003
Location: Aachen
Distribution: Opensuse 11.2 (nice and steady)
Posts: 2,203

Original Poster
Rep: Reputation: 45
Thx a lot both of u ... u were right
 
  


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