Question

Language C

How does a switch differ from an if?

What is a switch's controlling expression?

What happens in a switch if the break's are not used?

Why might if(0 <= y <= 9) not work as it might be expected?

How does the ?: operator work?

Answer 1

Dear Student,

here are the answer..

Ans:1

Switch stament does not compare the values it recieved a value and match the case as per the value recieved while and if condition is used to check the validation of the statement passed inside it.

Ex:

int num = 1;

switch(num)

{

case 1:

------

break;

case 2:

-------

break;

case 3:

-------

break;

default:

--------

break;

}

Example of if condition:

if(num>1)

{

statement..

}

==============================================================

Ans:2

Example of switch controlling expression

if num = 1

switch(num)

{

case 1:     //switch stament executes this case and avoid further cases.

------

break;

case 2:

-------

break;

case 3:

-------

break;

default:

--------

break;

}

===============================================================

If break condition is not used in cases then switch stament first goes to that case and executes all the furtehr cases.

Ex: In the below example control goes to case 1 and becasue we have not used the break so all the cases after case 1 got executed.

switch(num)

{

case 1:

------

case 2:

-------

case 3:

-------

default:

--------

break;

}

===============================================================

if(0 <= y <= 9) //this will not work because this is not the correct way in programming language.

The correct statement would be..

if(y>= 0 && y <=9)

=============================================================

?: this is called the ternary operator.

Ex:

int num = 5

int res = num > 0 ? printf("true") : printf("False");

in the above given expression if num value is greter than zero then res will be true otherwise res would be false.

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