Thread: Mayan Calander Conversion Issue

Hi guys,
I'm doing a past question to practice programming. The question is here: http://www.olympiad.org.uk/papers/2004/bio/q1.html

Its basically a calender conversion from a Mayan calender to the Gregorian calender. Heres what I have done with comments.

Code:

#include <stdio.h>

int main()
{
    int baktun, katun, tun, uinal, kin, mdays, diffrence, ydiffrence, months, day;
     
    printf("Enter the number of Baktuns:");
    scanf("%d",&baktun);
    printf("Enter the number of Katuns:");
    scanf("%d",&katun);                             /*Enter the Mayan Date*/
    printf("Enter the number of Tun:");
    scanf("%d",&tun);
    printf("Enter the number of Uinal:");
    scanf("%d",&uinal);
    printf("Enter the number of Kin:");
    scanf("%d",&kin);
    baktun = baktun * 20 * 20 * 18 * 20;
    katun = katun * 20 * 18 * 20;
    tun = tun * 18 * 20;                            /*Convert to Kin (Days)*/
    uinal = uinal * 20;
    mdays = baktun + katun + tun + uinal + kin;
    diffrence = mdays - 2018843;                    /*Subtract the date in days from Jan 01*/

    ydiffrence = diffrence / 365;                   /*Divide the answer by 365 to get diffrence in years*/
    ydiffrence = ydiffrence + 2000;                 /*Add 2000 to get to Mayan Base date and years */
    
    day = diffrence % 365;                          /*Days = the remainder when divided by 365*/
    
    if (diffrence > 365)
{
    months = diffrence - 365;                       /*Find the Month*/
                                                    
    printf ("January ");                            
}
    else if (months <= 59) 
{
    printf ("Febuary ");
}
    else if (months <= 90)
{
    printf ("March ");
}
    else if (months <= 120)
{
    printf ("April ");
}
    else if (months <= 151)
{
    printf ("May ");
}
    else if (months <= 181)
{
    printf ("June ");
}
    else if (months <= 212)
{
    printf ("July ");
}
    else if (months <= 243)
{
    printf ("August ");
}
    else if (months <= 274)
{
    printf ("September ");
}
    else if (months <= 304)
{
    printf ("October ");
}
    else if (months <= 334)
{
    printf ("November ");
}
    else if (months <= 365)
{
    printf ("December ");
}


if (months <= 31)
{
    printf("%d ",day);  /*Find the Day*/
    
}   

    else if (months <= 59)
{
    day = day - 31;
    printf("%d ",day);
   
} 
    else if (months <= 90)
{
    day = day - 59;
    printf("%d ",day);
    
} 
    else if (months <= 120)
{
    day = day - 90;
    printf("%d ",day);
    
} 
    else if (months <= 151)
{
    day = day - 120;
    printf("%d ",day);
    
} 
    else if (months <= 181)
{
    day = day - 151;
    printf("%d ",day);
    
} 
    else if (months <= 212)
{
    day = day - 181;
    printf("%d ",day);
    
} 
    else if (months <= 243)
{
    day = day - 212;
    printf("%d ",day);
   
} 
    else if (months <= 274)
{
    day = day - 243;
    printf("%d ",day);
   
} 
    else if (months <= 304)
{
    day = day - 274;
  
    printf("%d ",day);
  
} 
    else if (months <= 334)
{
    day = day - 304;
    
    printf("%d ",day);
    
} 
    else if (months <= 365)
{
    day = day - 334;
    
    printf("%d ",day);
    
} 
    else if  (months <= 90)
{
    day = day - 59;
    
    printf("%d ",day);
   
} 
    printf("%d",ydiffrence);

    getchar();
    getchar();
    return 0;
}

If I enter the test data: 13,20,9,29 the date should be 22nd March 2001 however I get 22nd Jan 2001 and entering other values closes the program. Any ideas?


Thanks in Advance