Can switches be nested?

This is a discussion on Can switches be nested? within the C Programming forums, part of the General Programming Boards category; Hi, I'm trying to get a program started but seem to have fallen at the first hurdle. :-( Please find ...

  1. #1
    Registered User JM1082's Avatar
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    Unhappy Can switches be nested?

    Hi,
    I'm trying to get a program started but seem to have fallen at the first hurdle. :-(

    Please find my code below. When executed it gets as far as the second switch statement then stops running, asking me to press any key to continue and closing the terminal window. Does anybody know if it's possible to nest switches in this way? Can you see where I'm going wrong?

    Code:
    #include <stdio.h>
    
    int main(void)
    {
        int month, first, i = 0;
    
        printf("Which month would you like to view?");
        scanf("%d", &month);
    
        switch (month) {
            case 1: printf("On which day does this month begin? ");
                    scanf("%d", &first);
    
                    printf("\n\nJanuary\n\nSun\tMon\tTue\tWed\tThu\tFri\tSat\n\n");
    
                    switch (first) {
                        case 1: printf("");
                                break;
                        case 2: printf("\t");
                                i = 1;
                                break;
                        case 3: printf("\t\t");
                                i = 2;
                                break;
                        case 4: printf("\t\t\t");
                                i = 3;
                                break;
                        case 5: printf("\t\t\t\t");
                                i = 4;
                                break;
                        case 6: printf("\t\t\t\t\t");
                                i = 5;
                                break;
                        case 7: printf("\t\t\t\t\t\t");
                                i = 6;
                                break;
                        default: printf("An error has occured, please restart the program!");
                                break;
                    }
                    for (; i > 31; i++) {
                        printf("%d\t", i);
    
                        if (i > 6) {
                        printf("\n\n");
                        }
                    }
        }
        return 0;
    }

  2. #2
    and the hat of wrongness Salem's Avatar
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    Perhaps you meant
    i < 31
    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
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    Don't see anything wrong with it unless the month to view is a no. not equal to 1.

  4. #4
    Registered User JM1082's Avatar
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    Yes! i < 31! How embarassing.....

  5. #5
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    And to answer your main question... Yes, switch trees can be nested to almost any level.

  6. #6
    'Allo, 'Allo, Allo
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    Quote Originally Posted by CommonTater View Post
    And to answer your main question... Yes, switch trees can be nested to almost any level.
    127 nested blocks and 1023 cases per switch are the limits described by C99 (5.2.4.1)

  7. #7
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    Quote Originally Posted by adeyblue View Post
    127 nested blocks and 1023 cases per switch are the limits described by C99 (5.2.4.1)
    Well... I did say "almost"...

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