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Beginner and I would love help :) date validation

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Beginner and I would love help :) date validation

 
0
  #1
Apr 12th, 2006
hello!

I need a program that validates the imput of dates. (Checks for leap years etc.)

The user enters: mm/dd/yyyy

The problem is, I have trouble with complex programs. I came up with this program, but i know it's too basic for what she wants. I need to have arrays in there, but i don't know how. I would love any help considering I'm bad at understanding this subject.




could someone help me ???!!!


C++ Syntax (Toggle Plain Text) 
  1. bool GoodDate(int month,int day,int year)
  2.  
  3.  
  4.     {
  5.     	/*** Bad Month ***/
  6.     	if(month < 1 || month > 12)
  7.     		return false;
  8.  
  9.     	/*** January ***/
  10.     	else if(month == 1)
  11.  
  12.  
  13.         	{
  14.         		if(day >=1 && day<= 31)
  15.         			return true;
  16.         		else
  17.         			return false;
  18.         	}
  19.  
  20.         	/*** Febuary ***/
  21.         	else if(month == 2) // divisible by 4 and either divisible by 400 or not divisible by 100
  22.  
  23.  
  24.             	{
  25.             		/*** if the year is a leap year... ***/
  26.             		if(year % 4 == 0 && (year % 400 == 0 || year % 100 != 0))
  27.  
  28.  
  29.                 		{
  30.                 			if(day >= 1 && day <= 29)
  31.                 				return true;
  32.                 			else
  33.                 				return false;
  34.                 		}
  35.                 		/*** if the year is not a leap year... ***/
  36.                 		else
  37.  
  38.                     		{
  39.                     			if(day >=1 && day <= 28)
  40.                     				return true;
  41.                     			else
  42.                     				return false;
  43.                     		}
  44.                     	}
  45.  
  46.                     	/*** March ***/
  47.                     	else if(month == 3)
  48.  
  49.  
  50.                         	{
  51.                         		if(day >=1 && day<= 31)
  52.                         			return true;
  53.                         		else
  54.                         			return false;
  55.                         	}
  56.  
  57.                         	/*** April ***/	
  58.                         	else if(month == 4)
  59.  
  60.  
  61.                             	{
  62.                             		if(day >=1 && day<= 30)
  63.                             			return true;
  64.                             		else
  65.                             			return false;
  66.                             	}
  67.  
  68.                             	/*** May ***/	
  69.                             	else if(month == 5)
  70.  
  71.  
  72.                                 	{
  73.                                 		if(day >=1 && day<= 31)
  74.                                 			return true;
  75.                                 		else
  76.                                 			return false;
  77.                                 	}
  78.  
  79.                                 	/*** June ***/	
  80.                                 	else if(month == 6)
  81.  
  82.  
  83.                                     	{
  84.                                     		if(day >=1 && day<= 30)
  85.                                     			return true;
  86.                                     		else
  87.                                     			return false;
  88.                                     	}
  89.  
  90.                                     	/*** July ***/	
  91.                                     	else if(month == 7)
  92.  
  93.  
  94.                                         	{
  95.                                         		if(day >=1 && day<= 31)
  96.                                         			return true;
  97.                                         		else
  98.                                         			return false;
  99.                                         	}
  100.  
  101.                                         	/*** August ***/	
  102.                                         	else if(month == 8)
  103.  
  104.  
  105.                                             	{
  106.                                             		if(day >=1 && day<= 31)
  107.                                             			return true;
  108.                                             		else
  109.                                             			return false;
  110.                                             	}
  111.  
  112.                                             	/*** September ***/	
  113.                                             	else if(month == 9)
  114.  
  115.  
  116.                                                 	{
  117.                                                 		if(day >=1 && day<= 30)
  118.                                                 			return true;
  119.                                                 		else
  120.                                                 			return false;
  121.                                                 	}
  122.  
  123.                                                 	/*** October ***/	
  124.                                                 	else if(month == 10)
  125.  
  126.  
  127.                                                     	{
  128.                                                     		if(day >=1 && day<= 31)
  129.                                                     			return true;
  130.                                                     		else
  131.                                                     			return false;
  132.                                                     	}
  133.  
  134.                                                     	/*** November ***/	
  135.                                                     	else if(month == 11)
  136.  
  137.  
  138.                                                         	{
  139.                                                         		if(day >=1 && day<= 30)
  140.                                                         			return true;
  141.                                                         		else
  142.                                                         			return false;
  143.                                                         	}
  144.  
  145.                                                         	/*** December ***/	
  146.                                                         	else if(month == 12)
  147.  
  148.  
  149.                                                             	{
  150.                                                             		if(day >=1 && day<= 31)
  151.                                                             			return true;
  152.                                                             		else
  153.                                                             			return false;
  154.                                                             	}
  155.                                                             	                                                            	else
  156.  
  157.                                                                 	{
  158.                                                                 		cout<<"Error\n";
  159.                                                                 		exit(0);
  160.                                                                 	}
  161.                                                                 	return false;
  162.                                                             }
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Re: Beginner and I would love help :) date validation

 
0
  #2
Apr 12th, 2006
Let me give you this hint - since several of the months have the same behavior - ie 1,3,5,7,8,10,12 are all 31 days, while 4,6,9,11 are all 30 days, then you could easily use a 'switch' statement on your month and not have to repeat all of that logic.
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Re: Beginner and I would love help :) date validation

 
0
  #3
Apr 13th, 2006
okay I came up with something a little more complex, but it's still not working. I know it's somewhere within my functions (either the bools or whatnot)......basically it's not telling them they entered an invalid date.

Any help?? I didn't put it in there, because I can't figure out where it goes logically.


/
C++ Syntax (Toggle Plain Text) 
  1. ************************Includes**************************************/
  2.  
  3. # include<iostream>
  4. # include<iomanip>
  5. using namespace std;
  6.  
  7. /************************Function call*********************************/
  8.  
  9. int isLeapYear(int year);                                //function
  10. int dateIsValid (int day, int month, int year);          //function
  11.  
  12.  
  13. /***********************Main******************************************/
  14.  
  15. int main()
  16. 	{
  17.       int value1, value2, value3;
  18. 	  char again;
  19.  
  20.       do
  21. 	  {
  22. 			cout << "Enter the day, month, and year. \n";
  23. 			cin  >> value1 >> value2 >> value3;
  24. 			dateIsValid(value1, value2, value3);               //call function
  25. 			cout << value1<<" "<< value2 <<" "<< value3<<endl;
  26. 			cout << " Do you want to enter another date? (Y/N)";
  27. 			cin >>again;
  28.  
  29. 	  }while (again =='Y' || again =='y');
  30.  
  31. 	  return 0;
  32. }
  33.  
  34.  /*************************FUNCTION*********************************/
  35.  
  36.     int dateIsValid(int day, int month, int year)
  37.  
  38.     {
  39. 		bool valid;
  40. 		int monthLength[13] =  { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  41.  
  42. 		 if ( isLeapYear(year) )
  43.              monthLength[2] = 29;    //  29 days in February in a leap year 
  44.  
  45. 		if ( month < 1 || month > 12 )
  46.         	valid = false;
  47. 	    else if ( day < 1 || day > monthLength[month] )
  48.         	valid = false;
  49.  
  50.     return ( valid );
  51.  
  52.     }
  53.  
  54.  /****************************FUNCTION*******************************************/
  55.  
  56.     int isLeapYear(int year)
  57.     {
  58.        bool result;
  59.  
  60.        if ( (year%4) != 0 )               //  or:    if ( year%4 )
  61.           result = false;                 //  means: if year is not divisible by 4
  62.        else if ( (year%400) == 0 )        //  or:    if ( !(year%400) )
  63.           result = true;                  //  means: if year is divisible by 400
  64.        else if ( (year%100) == 0 )        //  or:    if ( !(year%100) )
  65.           result = false;                //  means: if year is divisible by 100
  66.        else                              //  (but not by 400, since that case
  67.            result = true;                //  considered already)
  68.  
  69.     return ( result );
  70.  
  71.     }
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Re: Beginner and I would love help :) date validation

 
0
  #4
Apr 13th, 2006
put ur whole code so I can find the problem I did the same thing last week for my assignment.
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Re: Beginner and I would love help :) date validation

 
1
  #5
Mar 3rd, 2009
These examples are overly complicated. I found a simple one that totally handles leap years.

from: c++ checkdate date validation

c Syntax (Toggle Plain Text) 
  1. bool checkdate(int m, int d, int y)
  2. {
  3.   //gregorian dates started in 1582
  4.   if (! (1582<= y )  )//comment these 2 lines out if it bothers you
  5.      return false;
  6.   if (! (1<= m && m<=12) )
  7.      return false;
  8.   if (! (1<= d && d<=31) )
  9.      return false;
  10.   if ( (d==31) && (m==2 || m==4 || m==6 || m==9 || m==11) )
  11.      return false;
  12.   if ( (d==30) && (m==2) )
  13.      return false;
  14.   if ( (m==2) && (d==29) && (y%4!=0) )
  15.      return false;
  16.   if ( (m==2) && (d==29) && (y%400==0) )
  17.      return true;
  18.   if ( (m==2) && (d==29) && (y%100==0) )
  19.      return false;
  20.   if ( (m==2) && (d==29) && (y%4==0)  )
  21.      return true;
  22.  
  23.   return true;
  24. }
Last edited by blacklight332; Mar 3rd, 2009 at 10:14 pm.
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Re: Beginner and I would love help :) date validation

 
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  #6
Mar 3rd, 2009
A few years late, blacklight?
"Jedenfalls bin ich überzeugt, daß der Alte nicht würfelt."
"I became very sensitive to what will happen to all this and all of us." -Two geniuses named Albert
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