SWITCH CASE STATEMENT IN C

useful to engineering students

1. Switch statement in C
Session By
V. Balamurugan, AP/CSE

2. Switch statememnt inC

3. Switch statement
•Theswitch()casestatementisliketheifstatement
thatallowsustomakeadecisionfromanumber
ofchoices.
•Theswitchstatementrequiresonlyoneargument
ofanydatatype,whichischeckedwithanumber
ofcaseoptions.
•Theswitchstatementevaluatestheexpression
andthenlooksforitsvalueamongcaseconstants.
•Ifthevaluematcheswithacaseconstant,this
particularcasestatementisexecuted.
•Ifnot,thedefaultisexecuted.

4. Syntax
switch <expr>
{
case constant_1:
{
statements 1;
break;
}
case constant_2:
{
statements 2;
break;
}
default:
{
default statements;
}
}

6. Facts related to switch
•Duplicatecasesarenotallowed

7. Facts related to switch
•Onlythoseexpressionsareallowedinswitchwhichresultsin
anintegralconstantvalue

8. Facts related to switch
•Float value is not allowed as a constant value in case label.
Only integer constants/ constant expressions are allowed in
case label

9. Facts related to switch
•Variable expressions are not allowed in case labels. Although
macros are allowed

10. Facts related to switch
•Default can be placed anywhere inside the switch. It will still
get evaluated if no match is found
intmain()
{
intx=2;
switch(x){
default: printf(“default case”);
break;
case 1: printf(“Number is 1”);
break;
case 2: printf(“Number is 2”);
break;
}
}

11. 11
V.BALAMURUGAN AP/CSE
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Mail me @[email protected]