System clock

Hey guys im trying to exstract the hour from the system clock and then trying to fill it in the clock2 array so i can display it like an actual clock. But when i display the clock it has to print
'H' on the hour and 'm' for the minutes. Iv done something similar just before but im having trouble with doing it from the system time.

So far the function shows this..

for example it prints

Sat Feb 17 15:17:10 EST 2007

then it displays a round clock with hours 1 -12

[code


say if its one oclock it will print 2 HH on it i have to do same thing for minutes



what can i do to fill the array with the system hour and minutes not sure if this is correct
its not working but i thought maybe i could copy ptr into hour but only copy %I which is the hour then put that in the array

/* updating the system hour within the clock array */
/* strftime(hour, 100, "%I", ptr); */


clock2[hr[hour]][hc[hour]] = hs;
clock2[hr[hour]][hc[hour]+ 1] = hs;


[/code]

Code:

void displayClock2(int * optionStats)
{
   /*declarations*/
   struct tm *ptr; 
   time_t lt;
   int i, j;
   int tm_min;
   int tm_hour;
   char str[80];
   char hour[30];
   char minutes[30];
   char clock2[9][20] = { /* The array to hold the hard-coded clock */
        "        12         ",
        "   11        01    ",
        " 10            02  ",
        "                   ",
        "09      .       03 ",
        "                   ",
        " 08            04  ",
        "   07        05    ",
        "        06         "
      };

   /* Row and column numbers in clock array for hour positions. For
   * example, the "06" in the clock display is stored at position
   * [8, 8] in the clock matrix (see above) */

   const int hr[13] = {0, 1, 2, 4, 6, 7, 8, 7, 6, 4, 2, 1, 0};
   const int hc[13] = {0, 13, 15, 16, 15, 13, 8, 3, 1, 0, 1, 3, 8};	
    
   /* Hour and minute codes */
   const char hs = 'H', ms = 'm';

   lt = time(NULL);
   ptr = localtime(&lt);
   strftime(str, 100, "%a %b %d %X %Z %Y", ptr); 

   /* copies ptr time struct into str string then 
   formats string to day month day of month time
   then time zone then year*/
   printf("\n");
   printf(str);
   printf("\n");

   /* once the struct gets copied into our formatted string
   it can get printed out to the screen*/

   /* updating the system hour within the clock array*/
  /* strftime(hour, 100, "%I", ptr); */
   

   clock2[hr[hour]][hc[hour]] = hs;
   clock2[hr[hour]][hc[hour]+ 1] = hs;
   
   /* Display the clock */
    for (i = 0; i < 9; i++)
    {
        for (j = 0; j < 19; j++)
    	    printf("%c", clock2[i][j]);
        printf("\n");
    }
    printf("\n");


}

Hey can you also give the example of what you are expecting.. im' a bit confused.. about your requirement

> strftime(str, 100, "%a %b %d %X %Z %Y", ptr);
Rather than formatting it as a string, only to sscanf / strtod it back again, why not just do

hr = ptr->tm_hour;
etc

thankyou i tried that and i now get

i get an inconpatible types in assignment error? And also if i use tm_hour i get the whole 24 hour clock could i make it only between 1-12

iv done that and now i get a segmentation fault trying to exstract the hour then place it into the clock array and overrite it with the 'H' which is what hs is; char hs = 'h' for example

Code:

clock2[hr[ptr->tm_hour]][hc[ptr->tm_hour]] = hs;
   clock2[hr[ptr->tm_min]][hc[ptr->tm_min]] = hs;

This reminds me a lot of the last thread, where I told you 3 times that minutes goes from 0 to 59 and your hc/hr array only is of size 13:

segmentation fault with strtod
segmentation fault with strtod

Yehhh i thought it was because of that but then how i would use ptr->tm_hour to only get hours between 1-12 and not the whole 24 hour. If i can somehow only give out 1-12 i shouldnt seg fault but when i use ptr->tm_hour it will say something like 23 for hours because of the 24 hour clock. How can i just make it 11 oclock instead of 23

thanks for helping too

what about ptr->tm_hour %12

Well, to transform an 24hour system into an 12hour system, you can use:

int hour = ptr->tm_hour %13;

That will give you values between 0 and 12, or

int hour = ptr->tm_hour %12;

if you want between 0 and 11.

This solution won't work for the minutes though ...

kewl ill give it a try

Hey guys iv done the modular and it does print HH on the hour however it prints it on the wrong out. For example if the system time is two oclock it will print the HH on one oclock instead.

Code:

void displayClock2(int * optionStats)
{
   /*declarations*/
   struct tm *ptr; 
   time_t lt;
   int i, j;
   int tm_min;
   int tm_hour;
   int hour = tm_hour % 12;
   int a;
   char str[80];
  
   char clock2[9][20] = { /* The array to hold the hard-coded clock */
        "        12         ",
        "   11        01    ",
        " 10            02  ",
        "                   ",
        "09      .       03 ",
        "                   ",
        " 08            04  ",
        "   07        05    ",
        "        06         "
      };

   /* Row and column numbers in clock array for hour positions. For
   * example, the "06" in the clock display is stored at position
   * [8, 8] in the clock matrix (see above) */

   const int hr[13] = {0, 1, 2, 4, 6, 7, 8, 7, 6, 4, 2, 1, 0};
   const int hc[13] = {0, 13, 15, 16, 15, 13, 8, 3, 1, 0, 1, 3, 8};	
    
   /* Hour and minute codes */
   const char hs = 'H', ms = 'm';
   
   lt = time(NULL);
   ptr = localtime(&lt);
   
   strftime(str, 100, "%a %b %d %X %Z %Y", ptr); 
   /*hr = ptr -> tm_hour;*/

   /* copies ptr time struct into str string then 
   formats string to day month day of month time
   then time zone then year*/
   
   printf("\n");
   printf(str);
   printf("\n");
  
   /* once the struct gets copied into our formatted string
   it can get printed out to the screen*/

   /* updating the system hour within the clock array*/
   /*
   strftime(hour, 100, "%I", ptr); 
   strftime(minutes, 100, "%M", ptr);
   hour = (int) strtod(*ptr, hour);
   printf(hour);
   printf(minutes);
   */
   
   
   
   clock2[hr[hour]][hc[hour]+1] = hs;
   clock2[hr[hour]][hc[hour]] = hs;

   /* Round m to the nearest hour position */
   a = ptr->tm_min % 5;
   if( a >= 3)
   {
     a = ptr->tm_min / 5 + 1;
                  
   }
   else
   {
     a = ptr->tm_min / 5;
     clock2[hr[a]][hc[a]+ 1] = hs;
     clock2[hr[a]][hc[a]] = ms;
   }
   /* getting seg fault here array not large enough for what im
      trying to do*/
   if(a == 0)
   {
      a =12;
   }
   if(a==60)
   {
      a = 12;
   }
   clock2[hr[a]][hc[a]] = ms;
   clock2[hr[a]][hc[a]+ 1] = ms;


   /*
   
   clock2[hr[hour]][hc[hour]] = hs;
   clock2[hr[hour]][hc[hour]+ 1] = hs;*/
   
   /* Display the clock */
    for (i = 0; i < 9; i++)
    {
        for (j = 0; j < 19; j++)
    	    printf("%c", clock2[i][j]);
        printf("\n");
    }
    printf("\n");


}