code for day of year calculator

#include"stdio.h"
#include"conio.h"
int year,days,d;
void main ()
{
    printf("Enter year\n");
    scanf("%d",&year);
    days = 365*year + (year-1)/4 - (year-1)/100 + (year-1)/400 ;
    d=days%7;
    if(d==1)
        printf("Monday");
    else if(d==2)
        printf("Tuesday");
    else if(d==3)
        printf("Wednesday");
    else if(d==4)
        printf("Thursday");
    else if(d==5)
        printf("Friday");
    else if(d==6)
        printf("Saturday");
    else if(d==0)
        printf("Sunday");
    getch();
}

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