switch case with integer expression

Question

3.00/5 (3 votes)

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i am trying to use switch case instead of If Else statement, in which i have to first check lentgh of string and as per that i have to make cases of it.

C#

Switch (mystring.lentgh)
{
    case <=25:
    {
        //do this
        break;
    }
    case <50
    {
        //d0 this
        break;
    }
    default:
    break;
}

this is some thing i want to do but unable to get how to put "<25" in front of case cuase it is not appropriate as per switch case rules.

thankx in advance.

Posted 17-Dec-12 19:56pm

neeraj@max

Updated 17-Dec-12 20:19pm

lukeer

v2

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2 solutions

Solution 1

That's plainly not possible. case[^] can check for equality with a constant, no more.
Stay with ifs.

Posted 17-Dec-12 20:17pm

lukeer

Updated 17-Dec-12 20:21pm

v2

Comments

Sachin Gargava 18-Dec-12 2:28am

Switch case not allow this it is only match constant.

neeraj@max 18-Dec-12 2:45am

@lukeer: it is possible... there is a workaround for it.... why dont you check @Aarti's code .... :)
@Sachin Gargava: yes i know.. but being a developer we can make thing possible.. right... !!! :D

lukeer 18-Dec-12 3:15am

You mean the one that is simply a maintenance horror?
OP should keep its ifs. They are much more readable.

neeraj@max 18-Dec-12 4:01am

i did not said that this is good solution. i am saying this is a workaround.
ofcourse "If" is beetr then swicth in particular case.

Kim Togo 18-Dec-12 3:12am

Correct - Case statement has to be a constant expression.

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Aarti Meswania · Accepted Answer · 2012-12-17T20:24:00

Solution 2

example

C#

int i = 1;
switch (i)
{
   case 0: MessageBox.Show("Hello, this is 0"); break;
   case 1:
   case 2: MessageBox.Show("Hello, this is 1 and 2 block"); break;
}

or use some trick like below...
e.g.

C#

Switch (Math.Floor((mystring.lentgh - 1)/25))
{
    case 0://for <=25
    {
        //do this
        break;
    }
    case 1://for <=50
    {
        //d0 this
        break;
    }
    default:
    break;
}

Happy Coding!
:)

Posted 17-Dec-12 20:24pm

Aarti Meswania

Updated 17-Dec-12 20:41pm

v3

Comments

Kim Togo 18-Dec-12 3:15am

Nice. The only down side I can think of, is code readability and maintainability.

Aarti Meswania 18-Dec-12 3:22am

thank you! :)