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what's up guys welcome to this new series where we are explaining the prove the program which which you guys post on our comments now this is a new program in the previous one we saw how to find with the three points are collinear or not in in this video we'll be covering whether a date given to us by a user illegitimate or not now what do I mean by illegitimate date say now if I say 30 to December of 1990 now 30 to the December does not exist now in December there are only 31 days right so that's not a legitimate date but if I say first December that means that the date exists so it's a legitimate date now let's see what we need to consider now these are just listed the ones with the number of days in them and now in if in your childhood you remember you maybe have done a poem which I had actually and my teacher taught me the poem was such that 30 days has September April June and November all the rest have 31 except February alone now if you guys remember or maybe I've heard about this way now this makes it easier to remember how many days are there in a month now if you want you can go back and play my the part where I was singing and just maybe you can be collected now these are fairly simple except fabric for the years except for February now in February that 28 days but in the leap year the 29 days okay so now would you'll be thinking how do you find the leap year now if if you say that only by knowing whether the year is divisible by four I can say it is a leap year then I would say it's wrong now I'll explain you in detail what is a leap year now let's look at the concept of leap year now this is a earth which is in blue color and the Sun now this earth is revolving around the Sun continuously and the time taken by it to revolve around the the Sun is a consider to be one year right now so how many of in one year for exact one revolution around the Sun earth takes 36 365 point two four two three seven five days these this is the exact number and you typically known that we have 365 days out so now if you consider the difference now you are looking at around zero point or two four two three seven five definite now this is a very huge amount so they came up with some strategies so that they can overcome this difference now let's discuss the strategies and the rules that have been given to us now the rule one states that every 400th year is a leap year so according to that 1600 2000 and 2400 are leap years now looking at the second rule that is it states that every hundredth ear is not leap year now in this case the rule one is still valid apart from the four hundred year every hundredth year is not a leap Ian are you looking at 1700 1800 a 1900 and we have skipped the two thousand year because the rule one states that two thousand year is a leap year right so apart from them all are not all the others are not leap here now the rule three states that every in every leap year or every fourth year is a leap year or every year that is divisible by four is a leap year up now while we're doing that at the firm the rule one and rule two should be a satisfied now every fourth year is a leap year so that means that 2012 2016 and 2020 are leap years now we will be using this to test out the the leap the the data validation in the program so this is what we will be using in our algorithm so now let's jump into the code so I just created our file name saying a date valid and dot C and I'll just include stdio.h is pause for a moment and I'll just be writing down some macros that I'll be using now I just defined the macros for every month and the corresponding position in the year thus January's first and December is the 12th one now we will just be looking at writing the code now first we take input from the user so we'll display a message saying enter date in Beauty space mm space why bye-bye format and then we just take the four we will prepare the variables that will be requiring to store at the day a month and here so month and year now we will be taking the input for these values yeah so now that we have just scanned the input from the user now we need to write the logic to validate this date now we know that in every month there are predefined dates except for February that varies according to the leap year now first before doing this we'll just define a switch case where we'll have the case for each and every month now I'll just write the bear this skeleton of the switch I'll just be pausing the video for a moment because otherwise it will get too long now I just completed the switch I reserved down the maybe this year this is the skeleton that is required for this switch now the first case is I've written for January March May June August October and December which have 31 days then I've grouped those which have 30 days then I have a separate column for separate yes for February that is that can have twenty eight or a nine days depending on the leap year and so if suppose the user enters invalid input for that I have a default case now I know that these months have I know that these months have 31 days right so I'll just check if the day which the user has entered should be less than or equal to 31 right and I'll be putting one more condition saying that if suppose user enters some negative number so I'll just also take care of that so I'll put and day should be greater than zero because it's not a valid date right so if that's the case then what I'll do I'll just print print of saying that it is it is a valid it date okay now the same will be for the case in which we have once we have 30 days so I'll write if in this case the day should be greater than sorry should be less than or equal to 30 right and also the negative case saying that they should be greater than zero then I'll print that it is a valid it's all just copy-paste this saying that it's a valid okay now for the February case I need to first check whether it is a leap year or not so I'll have to check all the three rules I hope you remember them I'll just pull them out so that you can remember now these were the rules that we heard so first you need to take it to the 400th irid if it's so then it is a leap year and if it is divisible by four then it's a leap here all the rest cases or the hundredth ear is not a leap year so I'll just have to write three ifs for these cases so I'll write down say if your ear is divisible by 400 then it's a leap year okay so in this case the date can be of maximum till 29 right so 29 so we'll write the if it is a valid input so if it is not satisfied then it's not a valid date now we have checked the 200th year right so now we need to check for the hundredth year so I'll just write else else if if the year is divisible by 100 then it should it should have add the match 28 days right so I'll just be copy pasting this part and I'll just change the required that is in this case we need to have at the we can have at the max 28 days right so this is for for the divisibility 100 forgot it is what it is validates it is I should write not a valid date not a valid date and the last case that I need to consider else and if it is now if it is divisible by 4 then it's a leap year again so I'll just write down if then it's a leap year so I can have at the max 29 days so I'll just copy it and so yes we are done with the leap year now apart from this the rest all have 28 days right so I'll just write an else saying it should have 28 days and I'll just copy paste the 28 days one and so we are almost done checking now just I forgot to mention here the whether it's invalid or not so I'll just quickly write them I'll just paste them everywhere okay so and we need to handle just one case that is if user input some negative number or some number it is which is greater than 12 that like so we'll just print a message saying that it is not a valid valid date so by this I think we are done with this program we will just execute this code and see if it is it's validating properly so I'll just compile and run it so now it's popping oh I should have not written the case over here so now I think it should be I don't know so fully now it should execute properly so we'll enter 29 of February 2000 now you know that 2002 the leap years of 29th exist so it's a valid date now let's see if it evaluates other few cases so how about 29th of February of nineteen hundred year right does not leave your search shouldn't it is a not a valid date right so we are getting proper output and we'll check for some other case that is will check for say 31st November 31st November of 2000 now the only 30 days in November right so it's not a valid date so we I think this is the proper code we have executed properly I hope you understand this code and every bit of it and now the full explanation on the leap year why these three rules came I'll have a link in the description where I'll explain you in detail why they came up with these three rules apart from that I hope the code is understood properly and do like our video and subscribe our Channel and if you want any code that that you want us to solve please write in the comment section and we try to post the video in maybe one or two days and thank you