Struct Problem

This is a discussion on Struct Problem within the C Programming forums, part of the General Programming Boards category; Question: Write a function called clockKeeper that takes as its argument a dateAndTime structure. THe function should call the timeUpdate ...

  1. #1
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    Struct Problem

    Question: Write a function called clockKeeper that takes as its argument a dateAndTime structure. THe function should call the timeUpdate function, and if the time reaches midnight, the function should call the dateUpdate function to switch over to the next day. Have the function return the updated dateAndTime structure.

    My attempt: please see the attached file.


    Any help is much appreciated.

    Attached Files Attached Files

  2. #2
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    my attempt: (but the compiler is showing many errors which i couldn't seem to figure out)

    Code:
    #include <stdio.h>
    
    
    
    
    struct dateAndTime  clockKeeper (struct dateAndTime  dt)
    {
         struct time  timeUpdate (struct time  now);
         struct date  dateUpdate (struct date  today);
    
    
         dt.stime = timeUpdate (dt.stime);
    
    
        if ( dt.stime.hour == 0  &&  dt.stime.minutes == 0  &&  
             dt.stime.seconds == 0 )
             dt.sdate = dateUpdate (dt.sdate);
    
    
           return  dt;
    }
    
    
    
    
    int main (void)
    {
     struct dateAndTime  dt1 = { { 12, 31, 2004 }, { 23, 59, 59 } };
     struct dateAndTime  dt2 = { { 2,  28, 2008 }, { 23, 59, 58 } };
    
    
        printf ("Current date and time is %.2i/%.2i/%.2i "
            "%.2i:%.2i:%.2i\n",
            dt1.sdate.month, dt1.sdate.day, dt1.sdate.year,
            dt1.stime.hour, dt1.stime.minutes, dt1.stime.seconds);
    
    
        dt1 = clockKeeper (dt1);
    
    
        printf ("Updated date and time is %.2i/%.2i/%.2i "
            "%.2i:%.2i:%.2i\n\n",
            dt1.sdate.month, dt1.sdate.day, dt1.sdate.year,
            dt1.stime.hour, dt1.stime.minutes, dt1.stime.seconds);
    
    
        printf ("Current date and time is %.2i/%.2i/%.2i "
            "%.2i:%.2i:%.2i\n"
            dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
            dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        dt2 = clockKeeper (dt2);
    
    
        printf ("Updated date and time is %.2i/%.2i/%.2i "
            "%.2i:%.2i:%.2i\n\n",
            dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
            dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        printf ("Current date and time is %.2i/%.2i/%.2i "
            "%.2i:%.2i:%.2i\n",
            dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
            dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        dt2 = clockKeeper (dt2);
    
    
        printf ("Updated date and time is %.2i/%.2i/%.2i "
            "%.2i:%.2i:%.2i\n\n"
            dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
            dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        return 0;
    
    
    }
    Last edited by cougarsmustangs; 03-23-2013 at 11:41 PM.

  3. #3
    Registered User whiteflags's Avatar
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    Quote Originally Posted by cougarsmustangs View Post
    my attempt: (but the compiler is showing many errors which i couldn't seem to figure out)
    It helps if you post them.

    Code:
    mingw32-gcc.exe -Wall  -g  -pedantic -Wextra -Wall -ansi -g    -c C:\Users\Josh2\Documents\sandboxc\main.c -o obj\Debug\main.o
    C:\Users\Josh2\Documents\sandboxc\main.c:6:54: error: parameter 1 ('dt') has incomplete type
    C:\Users\Josh2\Documents\sandboxc\main.c:6:21: error: return type is an incomplete type
    C:\Users\Josh2\Documents\sandboxc\main.c: In function 'clockKeeper':
    C:\Users\Josh2\Documents\sandboxc\main.c:12:3: error: type of formal parameter 1 is incomplete
    C:\Users\Josh2\Documents\sandboxc\main.c:17:5: error: type of formal parameter 1 is incomplete
    C:\Users\Josh2\Documents\sandboxc\main.c:20:3: warning: 'return' with a value, in function returning void [enabled by default]
    C:\Users\Josh2\Documents\sandboxc\main.c:6:54: warning: unused parameter 'dt' [-Wunused-parameter]
    C:\Users\Josh2\Documents\sandboxc\main.c: In function 'main':
    C:\Users\Josh2\Documents\sandboxc\main.c:28:10: error: variable 'dt1' has initializer but incomplete type
    C:\Users\Josh2\Documents\sandboxc\main.c:28:10: error: extra brace group at end of initializer
    C:\Users\Josh2\Documents\sandboxc\main.c:28:10: error: (near initialization for 'dt1')
    C:\Users\Josh2\Documents\sandboxc\main.c:28:10: warning: excess elements in struct initializer [enabled by default]
    C:\Users\Josh2\Documents\sandboxc\main.c:28:10: warning: (near initialization for 'dt1') [enabled by default]
    C:\Users\Josh2\Documents\sandboxc\main.c:28:10: error: extra brace group at end of initializer
    C:\Users\Josh2\Documents\sandboxc\main.c:28:10: error: (near initialization for 'dt1')
    C:\Users\Josh2\Documents\sandboxc\main.c:28:10: warning: excess elements in struct initializer [enabled by default]
    C:\Users\Josh2\Documents\sandboxc\main.c:28:10: warning: (near initialization for 'dt1') [enabled by default]
    C:\Users\Josh2\Documents\sandboxc\main.c:28:23: error: storage size of 'dt1' isn't known
    C:\Users\Josh2\Documents\sandboxc\main.c:29:10: error: variable 'dt2' has initializer but incomplete type
    C:\Users\Josh2\Documents\sandboxc\main.c:29:10: error: extra brace group at end of initializer
    C:\Users\Josh2\Documents\sandboxc\main.c:29:10: error: (near initialization for 'dt2')
    C:\Users\Josh2\Documents\sandboxc\main.c:29:10: warning: excess elements in struct initializer [enabled by default]
    C:\Users\Josh2\Documents\sandboxc\main.c:29:10: warning: (near initialization for 'dt2') [enabled by default]
    C:\Users\Josh2\Documents\sandboxc\main.c:29:10: error: extra brace group at end of initializer
    C:\Users\Josh2\Documents\sandboxc\main.c:29:10: error: (near initialization for 'dt2')
    C:\Users\Josh2\Documents\sandboxc\main.c:29:10: warning: excess elements in struct initializer [enabled by default]
    C:\Users\Josh2\Documents\sandboxc\main.c:29:10: warning: (near initialization for 'dt2') [enabled by default]
    C:\Users\Josh2\Documents\sandboxc\main.c:29:23: error: storage size of 'dt2' isn't known
    C:\Users\Josh2\Documents\sandboxc\main.c:49:11: error: expected ')' before 'dt2'
    C:\Users\Josh2\Documents\sandboxc\main.c:73:11: error: expected ')' before 'dt2'
    C:\Users\Josh2\Documents\sandboxc\main.c:29:23: warning: unused variable 'dt2' [-Wunused-variable]
    C:\Users\Josh2\Documents\sandboxc\main.c:28:23: warning: unused variable 'dt1' [-Wunused-variable]
    Process terminated with status 1 (0 minutes, 0 seconds)
    18 errors, 12 warnings (0 minutes, 0 seconds)
    Where did you write your structure declarations? Most of the rest are here because you didn't actually declare or include the structure types in this file.

  4. #4
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    how about now?

    Code:
    #include <stdio.h>
    
    
    struct date
    {
    	int month;
    	int day;
    	int year;
    };
    
    
    struct time
    {
    	int seconds;
    	int minutes;
    	int hour;
    };
    
    
    struct dateAndTime  clockKeeper (struct dateAndTime  dt)
    {
         struct time  timeUpdate (struct time  now);
         struct date  dateUpdate (struct date  today);
    
    
         dt.stime = timeUpdate (dt.stime);
    
    
    	if ( dt.stime.hour == 0  &&  dt.stime.minutes == 0  &&  			dt.stime.seconds == 0 )
    	     dt.sdate = dateUpdate (dt.sdate);
    
    
       	return  dt;
    }
    
    
    
    
    int main (void)
    {
     struct dateAndTime  dt1 = { { 12, 31, 2004 }, { 23, 59, 59 } };
     struct dateAndTime  dt2 = { { 2,  28, 2008 }, { 23, 59, 58 } };
    
    
        printf ("Current date and time is %.2i/%.2i/%.2i "
    	    "%.2i:%.2i:%.2i\n",
    	    dt1.sdate.month, dt1.sdate.day, dt1.sdate.year,
    	    dt1.stime.hour, dt1.stime.minutes, dt1.stime.seconds);
    
    
        dt1 = clockKeeper (dt1);
    
    
        printf ("Updated date and time is %.2i/%.2i/%.2i "
    	    "%.2i:%.2i:%.2i\n\n",
    	    dt1.sdate.month, dt1.sdate.day, dt1.sdate.year,
    	    dt1.stime.hour, dt1.stime.minutes, dt1.stime.seconds);
    
    
        printf ("Current date and time is %.2i/%.2i/%.2i "
    	    "%.2i:%.2i:%.2i\n"
    	    dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
    	    dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        dt2 = clockKeeper (dt2);
    
    
        printf ("Updated date and time is %.2i/%.2i/%.2i "
    	    "%.2i:%.2i:%.2i\n\n",
    	    dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
    	    dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        printf ("Current date and time is %.2i/%.2i/%.2i "
    	    "%.2i:%.2i:%.2i\n",
    	    dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
    	    dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        dt2 = clockKeeper (dt2);
    
    
        printf ("Updated date and time is %.2i/%.2i/%.2i "
    	    "%.2i:%.2i:%.2i\n\n"
    	    dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
    	    dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        return 0;
    
    
    }

  5. #5
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    I compiled it and its still showing errors:




    Code:
    $ vim ex9.5.c
    
    
    
    
    $ gcc ex9.5.c
    ex9.5.c:17:53: error: parameter 1 ('dt') has incomplete type
    ex9.5.c:17:21: error: return type is an incomplete type
    ex9.5.c: In function 'clockKeeper':
    ex9.5.c:28:5: warning: 'return' with a value, in function returning void [enable
    d by default]
    ex9.5.c: In function 'main':
    ex9.5.c:33:12: error: variable 'dt1' has initializer but incomplete type
    ex9.5.c:33:12: error: extra brace group at end of initializer
    ex9.5.c:33:12: error: (near initialization for 'dt1')
    ex9.5.c:33:12: warning: excess elements in struct initializer [enabled by defaul
    t]
    ex9.5.c:33:12: warning: (near initialization for 'dt1') [enabled by default]
    ex9.5.c:33:12: error: extra brace group at end of initializer
    ex9.5.c:33:12: error: (near initialization for 'dt1')
    ex9.5.c:33:12: warning: excess elements in struct initializer [enabled by defaul
    t]
    ex9.5.c:33:12: warning: (near initialization for 'dt1') [enabled by default]
    ex9.5.c:33:25: error: storage size of 'dt1' isn't known
    ex9.5.c:34:12: error: variable 'dt2' has initializer but incomplete type
    ex9.5.c:34:12: error: extra brace group at end of initializer
    ex9.5.c:34:12: error: (near initialization for 'dt2')
    ex9.5.c:34:12: warning: excess elements in struct initializer [enabled by defaul
    t]
    ex9.5.c:34:12: warning: (near initialization for 'dt2') [enabled by default]
    ex9.5.c:34:12: error: extra brace group at end of initializer
    ex9.5.c:34:12: error: (near initialization for 'dt2')
    ex9.5.c:34:12: warning: excess elements in struct initializer [enabled by defaul
    t]
    ex9.5.c:34:12: warning: (near initialization for 'dt2') [enabled by default]
    ex9.5.c:34:25: error: storage size of 'dt2' isn't known
    ex9.5.c:37:6: error: invalid operands to binary % (have 'char *' and 'complex do
    uble')
    ex9.5.c:37:10: error: expected ')' before ':' token
    ex9.5.c:37:10: error: stray '\' in program
    ex9.5.c:37:22: warning: missing terminating " character [enabled by default]
    ex9.5.c:37:10: error: missing terminating " character
    ex9.5.c:51:6: error: expected ')' before 'dt2'
    ex9.5.c:70:6: error: expected ')' before 'dt2'

  6. #6
    Registered User whiteflags's Avatar
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    Quote Originally Posted by cougarsmustangs View Post
    how about now?
    Better, but still missing type declarations.

    Quote Originally Posted by cougarsmustangs View Post
    I compiled it and its still showing errors:
    ex9.5.c:17:53: error: parameter 1 ('dt') has incomplete type

    Notice the type of dt
    Notice that type declaration is missing.
    Thus everything that depends on that declaration is "wrong".

    If you still have compiler errors after correcting that, then they should be easy to figure out.

  7. #7
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    am i on the right track? I compiled this and its still showing pretty much the same errors
    Code:
    #include <stdio.h>
    
    
    int dt;
    
    
    struct date
    {
        int day;
        int month;
        int year;
    };
    
    
    struct time
    {
        int seconds;
        int minutes;
        int hour;
    };
    
    
    struct dateAndTime  clockKeeper (struct dateAndTime dt)
    {
         struct time  timeUpdate (struct time  now);
         struct date  dateUpdate (struct date  today);
    
    
         dt.stime = timeUpdate (dt.stime);
    
    
        if ( dt.stime.hour == 0  &&  dt.stime.minutes == 0  &&
             dt.stime.seconds == 0 )
             dt.sdate = dateUpdate (dt.sdate);
    
    
           return  dt;
    }
    
    
    int main (void)
    
    
    int dt1;
    int dt2;
    
    
    {
        struct dateAndTime  dt1 = { { 12, 31, 2004 }, { 23, 59, 59 } };
        struct dateAndTime  dt2 = { { 2, 28, 2008 }, { 23, 59, 58 } };
    
    
        printf ("Current date and time is %.2i/%.2i/%.2i "
            %.2i:%.2i:%.2i\n",
            dt1.sdate.month, dt1.sdate.day, dt1.sdate.year,
            dt1.stime.hour,
             dt1.stime.minutes, dt1.stime.seconds);
    
    
        dt1 = clockKeeper (dt1);
    
    
        printf ("Updated date and time is %.2i/%.2i/%.2i "
            "%.2i:%.2i:%.2i\n\n",
            dt1.sdate.month, dt1.sdate.day, dt1.sdate.year,
            dt1.stime.hour, dt1.stime.minutes, dt1.stime.seconds);
    
    
        printf ("Current date and time is %.2i/%.2i/%.2i "
            "%.2i:%.2i:%.2i\n"
            dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
            dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        dt2 = clockKeeper (dt2);
    
    
        printf ("Updated date and time is %.2i/%.2i/%.2i "
            "%.2i:%.2i:%.2i\n\n",
            dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
            dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        printf ("Current date and time is %.2i/%.2i/%.2i "
            "%.2i:%.2i:%.2i\n",
            dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
            dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        dt2 = clockKeeper (dt2);
    
    
        printf ("Updated date and time is %.2i/%.2i/%.2i "
            "%.2i:%.2i:%.2i\n\n"
            dt2.sdate.month, dt2.sdate.day, dt2.sdate.year,
            dt2.stime.hour, dt2.stime.minutes, dt2.stime.seconds);
    
    
        return 0;
    
    
    }

  8. #8
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    Oh oh me me me - I knows teh answers to this one -> Struct Problem Please help - Dev Shed
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