1999 LSU Computer Science High School Programming Contest
Novice and Veteran Problem 5
How much older than me are you?

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Problem Statement

Many people quite often want to know how much older (or younger) they are than their friends.

You will be given pairs of birthdates and you are to determine how many days older the oldest is than the youngest. All dates will be between January 1, 1910 and December 31, 1999. The format of the date will be month, followed by day, followed by year for the first date and then the same information for the second date. Each input item will be on a separate line. Terminate the program when the month of the first date is a -1.

Example Input:

8 
4 
58 
5 
21 
57
1 
15 
85  
6 
25 
96
12 
27 
78  
7 
11 
75
-1

In the first example above, the first date is 8/4/58 (August 4, 1958) and the second date is 5/21/57 (May 21, 1957).

Sample Output:

8/4/58 is 440 days after 5/21/57      
1/15/85 is 4179 days before 6/25/96    
12/27/78 is 1265 days after 7/11/75

NOTE: The exact spacing above is not critical. Having date is # days before or after date is. Specifying date as day/month/year is imporant, but spacing is not critical.



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Clarifications:






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Source Code for a Solution to this Problem

// preprocessor directives
#include <stdio.h>

#define QUIT -1

// typedefs
typedef struct node
{
   int month,day,year;
}DATE;

// prototypes
int convert(DATE first, DATE second,int month[]);


int main(void)
{
   int i,days;
   int month[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
   DATE first,second;
   char string[7];

  scanf("%d",&first.month);
  while( first.month != QUIT)
  {
      scanf("%d %d %d %d %d",&first.day,&first.year,
         &second.month,&second.day,&second.year);

      if(second.year > first.year)
       {
         strcpy(string,"before");
         days = convert(second,first,month);
       }  //if
     else
      {
        strcpy(string,"after");
        days = convert(first,second,month);
      }  //else

    printf("%d/%d/%d is %d days %s %d/%d/%d.\n",first.month,first.day,
           first.year,days,string,second.month,second.day,second.year);

    scanf("%d",&first.month);

 } // while

  return 0;

}


/*
   convert:  accepts copies of the date structures
             returns the integer number of days between 
             two dates
*/
int convert(DATE first, DATE second, int month[])
{
   int i,j,days = 0;
 
   days += ( (first.year - second.year) - 1) * 365;
   for(i=1; i < first.month; i++)
     days += month[i];
   for(i = second.month + 1; i <= 12; i++)
     days += month[i];
   days += month[second.month] - second.day;
   days += first.day;
   for(i = second.year + 1; i < first.year; i++)
     if( i % 4 == 0 ) 
       days++;
   if( first.year % 4 == 0 && first.month >= 2)
     days++; 
  if( (second.year % 4) == 0 && second.month < 3)
     days++;
 
  return days;
} // convert

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Sample Input

8
4
58
5
21
57
1
15
85
6
25
96
12
27
78
7
11
75
0

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Sample Output

8/4/58 is 440 days after 5/21/57.
1/15/85 is 4179 days before 6/25/96.
12/27/78 is 1265 days after 7/11/75.

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Judge Data Set 1 - Input

8 
4 
58 
5 
21 
57
1 
15 
85  
6 
25 
96
12 
27 
78  
7 
11 
75
11
09
90
04
10
99
04
15
99
04
15
89
04
02
99
04
02
28
05
21
91
05
21
75
-1

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Judge Data Set 1 - Output

8/4/58 is 440 days after 5/21/57.
1/15/85 is 4179 days before 6/25/96.
12/27/78 is 1265 days after 7/11/75.
11/9/90 is 3074 days before 4/10/99.
4/15/99 is 3652 days after 4/15/89.
4/2/99 is 25932 days after 4/2/28.
5/21/91 is 5844 days after 5/21/75.

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Judge Data Set 2 - Input

4
8
99
12
5
91
01
01
10
04
10
99
12
31
99
01
01
10
10
08
57
08
04
58
01
01
20
12
19
33
10
19
28
10
11
11
-1

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Judge Data Set 2 - Output

4/8/99 is 2681 days after 12/5/91.
1/1/10 is 32606 days before 4/10/99.
12/31/99 is 32871 days after 1/1/10.
10/8/57 is 300 days before 8/4/58.
1/1/20 is 5101 days before 12/19/33.
10/19/28 is 6218 days after 10/11/11.

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The statements and opinions included in these pages are those of the LSU High School Programming Contest Staff only. Any statements and opinions included in these pages are not those of Louisiana State University or the LSU Board of Supervisors.
© 1999 LSU High School Programming Contest

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