C# .NET - C++ HELP

i would like to ask help from u guys.. i dun understand what the below c++ code means. so please help me to explain.

void main()
{
   int hour1,minute1,hour2,minute2,zone[4]={0};
   
   input_time(&hour1,&minute1,&hour2,&minute2);
   duration(hour1,minute1,hour2,minute2,zone);
   printf("\nDurations = (%3d,%3d,%3d,%3d) \n",zone[0],zone[1],zone[2],zone[3]);
   printf("Total charge = $%.2f\n\n",charge(zone));
}

void input_time(int *h1, int *m1, int *h2, int *m2)
{
   printf("\nEnter start time (in hr and min): ");
   scanf("%d %d",h1,m1);
   printf("Enter end time (in hr and min): ");
   scanf("%d %d",h2,m2);
}

void duration(int h1, int m1, int h2, int m2, int z[])
{
   const int limit[4]={6,14,20,24}
   int i=0,temph,tempm;

   temph=h1;
   tempm=m1;

   while (interval (temph,tempm,h2,m2)>0)
      {
         if (temph<limit[i]) 
         {
            if (h2>=limit[i])
               z[i]=interval(temph,tempm,limit[i],0);
            else
               z[i]=interval(temph,tempm,h2,m2);
            temph=limit[i];
            tempm=0;
         }
         i++;
      }   
}

int interval(int h1,int m1,int h2,int m2)
{
   return ((h2*60+m2)-(h1*60+m1));
}

float charge(int z[])
{
   return (float) (z[0]*5+z[1]*10+z[2]*8+z[3]*5)/100;
}

the main method is main() and it's the entry point to the code...

You have 4 methods that do the processing for you and they are:
input_time
   The parameters to the method are pointers so the values being passed into the method get changed; they are not copied.
   This method will prompt the user to enter a start time using printf and reads it from the command line using scanf.  It then prompts for the end time and reads it from the command line.

duration
   the paramters to this method are "pass by value" not referenced like the pointers used in input_time so they will not changed when the method returns.  This is not true for z since it is an array and it's storing the calculation for the interval between the times.  there are some special values that are being checked in this too and you can see it in the const int limit.
   
interval
   calculates the interval between two times (in minutes) because it is multiplying by 60.

charge
   z[0]*5+z[1]*10+z[2]*8+z[3]*5)/100;
   Looks like this is taking the 4 intervals and multiplying by the values 5, 10, 8, 5 and adding them together.  This is then being divided by 100.


Good luck with it!

thanks a lot man..
erm, can u explain a bit more on the :
temph=h1
tempm=m1

 and the interval part..

That is just the hour and the minute.  It just makes a copy of hr and m1 to be used instead of the original.  They don't do much because tempm gets reset at the bottom of the while loop everytime and the temph gets set the the new limit at the bottom of the while loop.

the interval looks like it just is multiplying the time by 60 and adding the minutes to that calculation and the return value is the difference between them.