how to use range in switch-case

This is a discussion on how to use range in switch-case within the C Programming forums, part of the General Programming Boards category; Hi! Guys Can anyone help me in knowing how can i specify a range in switch case. For example if ...

  1. #1
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    Thumbs down how to use range in switch-case

    Hi! Guys

    Can anyone help me in knowing how can i specify a range in switch case.
    For example if the code in nested if else is as follows :

    if(i<0) printf("Negative");
    else if(i>0) printf("positive");
    else printf("No. is Zero");

    Now my point is how can one make this module using switch-case.

    Thanks And regards
    Himanshumad.

  2. #2
    and the hat of wrongness Salem's Avatar
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    > Can anyone help me in knowing how can i specify a range in switch case.
    You can't

    You have to list every single value, and since you need the full range of int, that's gonna take some typing...
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. #3
    Registered User alex's Avatar
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    You can't use ranges in switch... But you can do this:

    Code:
    switch((i>0)-(i<0))
    {
       case 1: printf("positive\n"); break;
       case 0: printf("zero\n"); break;
       case -1: printf("negative\n"); break;
    }
    alex

  4. #4
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    I will take Alex word about switch but what you could do....

    Code:
    if ( i == 0) printf("Zero");
    else  printf("%s", i < 0 ? "Negative":"Positive");
    hoping to be certified (programming in c)
    here's the news - I'm officially certified.

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