Program to find angle between hours and mins hands of a clock

Question

Hi all Can you please help me to write the logic in c#.. Hours and mins have not been mentioned

Vulpes · Answer

Here's a modified version which now checks that the hours entered are between 0 and 23 inclusive and that the minutes are between 0 and 59 inclusive. The program simply keeps requesting the hour or minutes until an acceptable value is input. When you say 24 hour format I've assumed that it's only the hours entered that may be in 24 hour format and the clock itself only has twelve hours. Notice that this still isn't fool-proof as if someone entered (say) abc for the hour the program would terminate with an exception. It's possible to deal with such input errors but as I'm not sure whether you've learned the techniques needed (try/catch statement or int.TryParse) I've ignored them for now. I've also changed the angular difference so that it's now never more than 180 degrees i.e. if the difference were 300 degrees then it's just the same as it being 60 degrees when viewed from the opposite direction: using System; class Clock { static void Main() { while(true) { int hours; do { Console.Write(Enter hours (0 to 23) : ); hours = int.Parse(Console.ReadLine()); } while (hours 23); if (hours > 11) hours -= 12; int mins; do { Console.Write(Enter minutes (0 to 59) : ); mins = int.Parse(Console.ReadLine()); } while (mins 59); double hDegrees = (hours * 30) + (mins * 30.0 / 60); double mDegrees = mins * 6; double diff = Math.Abs(hDegrees - mDegrees); if (diff > 180) diff = 360 - diff; Console.WriteLine(The angle between the hands is {0} degrees diff); Console.Write(Do another y/n : ); string yn = Console.ReadLine(); if (yn == n) return; Console.WriteLine(); } } }

rani m mk · Answer

Vulpes Code works fine for 12 hrs format. But it also takes hrs entered more than 11.. And mins entered more than 59.. How to restrict user and also allow user to enter time in 24hrs format Thanks

Vulpes · Answer

I haven't tried Jignesh's code but here's my own attempt though error checking needs to be added: using System; class Clock { static void Main() { while(true) { Console.Write(Enter hours (0 to 11) : ); int hours = int.Parse(Console.ReadLine()); Console.Write(Enter minutes (0 to 59) : ); int mins = int.Parse(Console.ReadLine()); double hDegrees = (hours * 30) + (mins * 30.0 / 60); double mDegrees = mins * 6; double diff = Math.Abs(hDegrees - mDegrees); Console.WriteLine(The angle between the hands is {0} degrees diff); Console.Write(Do another y/n : ); string yn = Console.ReadLine(); if (yn == n) return; Console.WriteLine(); } } }

Jignesh Trivedi · Answer

hi Rani Equation for the angle between the hands angle = (60*H - 11*M) / 2 H is the hour M is the minute static void Main(string[] args) { Console.WriteLine(Enter time (hours:Min) ->); string hhmm = Console.ReadLine(); var hh = Convert.ToDouble(hhmm.Split(new char[] { ':' })[0].Trim()); var mm = Convert.ToDouble(hhmm.Split(new char[] { ':' })[1].Trim()); var angle = (60 * hh - 11 * mm) / 2; Console.WriteLine(angle between hours and mins hands of a clock :  + angle); } hope this will help you.

rani m mk · Answer

Vulpes Since i am new to c# please can you help me put it in c# code

Vulpes · Answer

Well each hour on the clock will represent an angle of 30 degrees (360 divided by 12). Similarly each minute on the clock will represent an angle of 6 degrees (360 divided by 60). Also the angle for an hour will increase as the minutes for that hour increase. So the basic formulas you'll need should be as follows: // hour is an int between 0 and 11 inclusive // mins is an int between 0 and 59 inclusive int hDegrees = (hours * 30) + (mins * 30 / 60); int mDegrees = mins * 6; int diff = Math.Abs(hDegrees - mDegrees);