Thread: 24-hour time to 12-hour time

OK I got this so far:

Code:

#include <stdio.h>

main ()
{

int tfhour;
int tfseconds;
int twhour;

        printf("Enter a 24-hour time (ex. 10:23): ");
        scanf("%d:%d", &tfhour, &tfseconds);

        if (tfseconds > 60 || tfseconds < 0)
			{
			printf("Not a valid seconds time!\n");
			return;
			}
		
		if (tfhour <= 12 && tfhour >= 0)
             printf("Equivalent 12-hour time: %d:%.2d AM\n", tfhour, tfseconds);
                                                                               
		else if (tfhour >= 13 && tfhour <= 24)
            {
             twhour = (tfhour - 12);
             printf("Equivalent 12-hour time: %d:%d PM\n", twhour, tfseconds);
            }

        else
        printf("Not a valid hour!\n");
        return;

}

I got two questions!
1) I need to get two zeros on the seconds output instead of a single digit. I know why it is doing it..lol But I need to know how to fix it?

2) As far as military time is concerned 12:00 is 12:00 pm while 24:00 is 12:00 AM. How can I get that to work out like that? Another if statement maybe?

Any help would be appreciated!

How about this:

Code:

#include <stdio.h>

main ()
{

int tfhour;
int tfseconds;
int twhour;

        printf("Enter a 24-hour time (ex. 10:23): ");
        scanf("%d:%d", &tfhour, &tfseconds);

        if (tfseconds > 60 || tfseconds < 0)
			{
			printf("Not a valid seconds time!\n");
			return;
			}
		
		if(tfhour<0 || tfhour>24) printf("Not a valid hour!\n");
		else {
		  printf("Equivalent 12-hour time: %d:%.2d ", tfhour, tfseconds);
		  if(tfhour/12 == 1) printf("PM\n"); else printf("AM\n");
		}
        return;

}

Code:

 if (hour > 12)
 {
   hour -= 12;
   pm = 1;
 }

sorted.

OK after reading through everyones suggestions I came up w/ this:

Code:

#include <stdio.h>

main ()
{

int tfhour;
int tfseconds;
int twhour;

        printf("Enter a 24-hour time (ex. 10:23): ");
        scanf("%d:%d", &tfhour, &tfseconds);
	
	if (tfseconds > 60 || tfseconds < 0)
			{
			printf("Not a valid seconds time!\n");
			return;
			}
	
	if(tfhour <= 0 || tfhour > 24) 
		{
		printf("Not a valid hour!\n");
        return;
		}

	else if (tfhour <= 12 && tfhour > 0)
			twhour = tfhour;
			                                                                              
	else if (tfhour >= 13 && tfhour <= 24)
			twhour = (tfhour - 12);
	
	printf("Equivalent 12-hour time: %d:%.2d ", twhour, tfseconds);

    if (tfhour / 12 == 1) 
		printf("PM\n"); 
		
	else 
		printf("AM\n");

        return;
}

It seems to work, but seeing if maybe the experts can find something else wrong w/ it?...lol I'm not looking for effiecent here...just making sure it works!

To make it more efficient you could replace that:

Code:

else if (tfhour <= 12 && tfhour > 0)
			twhour = tfhour;
			                                                                              
	else if (tfhour >= 13 && tfhour <= 24)
			twhour = (tfhour - 12);

with that:

Code:

twhour=(tfhour-1)%12+1;

Just as a note, 00:00 is valid to use instead of 24:00