t displays all the possible times on a digital 12-hour clock, starting at 1:00:00 and ending at 12:59:59.

[civilVIU]

Hey so im trying to do some practice in c++, and this seemed like a good challenge. So far all i can do is get seconds to go up to 60, then all hope is lost:P heres what i have so far, please give me some direction on how to get the reest going.. my thinking is probably a funtion for each time (ie getHours, getMins, getSeconds, etc.). Any help will be awesome!

BTW i am using the <iostream> library..

#include <iostream>
#include <iostream>

using namespace std;

int main()
{
    int hour = 1;
    int min = 00;
    int sec = 00;
   
    while (sec < 60) {
          
        cout << hour << ":" << min << ":" << sec << endl;
        sec++;
    }
        
        while (min < 60){
            cout << hour << ":" << min << ":" << sec << endl;
            min++;
            }
        
    
    
    
    
    
    
    system("pause");
}

EDIT: I cant seem to show you guys the output of the program..i use cmd to run it, and i cant copy the content. any help?

[TheIdeasMan]

I would use nested for loops, rather than while.

Challenge: Should be able to do it in 5 lines (not counting includes, namespace etc)

BTW i am using the <iostream> library..

I can see that - you have it in there twice!!

Consider using std::cout instead of using namespace std;

Something similar for other std things like cin, endl etc.

Hope all goes well.

Edit :

int sec = 00;

Doesn't do what you think it does.

[modoran]

So do you want to display a timespan (time difference) or just current time ?

[whitenite1]

@civilVIU

Here's one way to it. And if your wanting the time to update each second, instead of a fast scroll, add in #include <windows.h> and put Sleep(1000); // 1 second delay after std::cout << hour << ":" << min << ":" << sec << std::endl;

#include <iostream>


int main()
{
    int hour = 1;
    int min = 00;
    int sec = 00;
   
    while (hour < 13)
	{
        std::cout << hour << ":" << min << ":" << sec << std::endl;
        sec++;
		if (sec>59)
		{
			sec=0;
			min++;
		}
		if (min>59)
		{
			min=0;
			hour++;
		}
    }    
    system("pause");
}

[Ch1156]

I made something very similar, here is the code if you want to play around with it, or just look at it to help you out:

#include <iostream>
#include <windows.h>
#include <time.h>

using namespace std;

int main()
{
    int minutes = 0;
    int hours = 0;
    int seconds = 0;
    int days = 0;

    while(true)
    {
        system("cls");
        time_t current = time(0);
        cout << ctime(&current) << endl;
        cout << "Days: " << days << endl;
        cout << "Hours: " << hours << endl;
        cout << "Minutes: " << minutes << endl;
        cout << "Seconds: " << seconds << endl;

        for(int i = 0; i < 1; i++)
        {
            seconds += 1;
        }

            if(seconds == 60)
            {
                minutes += 1;
                seconds = 0;
            }
            if(minutes == 60)
            {
                hours += 1;
                minutes = 0;
            }
            if(hours == 24)
            {
                days += 1;
                hours = 0;
            }
            Sleep(1000);
    }
}

[TheIdeasMan]

Hmmm, a way to go to meet the 5 line challenge.

One immediate short cut is to output in 12:23:16 format.

Another observation is that 12 hours of out put is 12*60*60 = 43,200 lines

[tntxtnt]

I took the 5-line challenge :)

for (int hh = 1; hh <= 12; ++hh)
    for (int mm = 0; mm < 60; ++mm)
        for (int ss = 0; ss < 60; ++ss)
            printf("%2d:%02d:%02d\n", hh, mm, ss);

4 line

My first thought of this problem is using strftime (http://www.cplusplus.com/reference/clibrary/ctime/strftime/)

#include <iostream>
#include <time.h>
#include <windows.h>

int main ()
{
    time_t rawtime;
    struct tm *timeinfo;
    char buffer[10];

    while (true)
    {
        time(&rawtime);
        timeinfo = localtime(&rawtime);

        strftime(buffer,10,"%I:%M:%S",timeinfo);
        std::cout << buffer << std::endl;

        Sleep(1000);
    }

    return 0;
}

[TheIdeasMan]

I like the first one, that's what I was thinking.

The second one will take 12hours to complete!! go on forever!!! It shows how careful you need to be with infinite loops.

I hope the OP & others have learnt a little bit today.