static void weekofyear(int year,int month,int day,
int *rtn_year,int *rtn_week,int *rtn_day)
{
int firstday=dayofweek(year,0,0);
int doy=dayofyear(year,month,day);
if(firstday>=5)
{
firstday-=7;
if(firstday+doy<0)
{
weekofyear(year-1,12-1,31-1,
rtn_year,rtn_week,rtn_day);
*rtn_day+=doy+1;
return;
}
}
if(firstday!=4 && (firstday+doy)/7>=52)
{
*rtn_year=year+1;
*rtn_week=0;
*rtn_day=(firstday+doy)-52*7;
}
else
{
*rtn_year = year;
*rtn_week = (firstday+doy)/7;
*rtn_day = (firstday+doy)%7;
}
}
int main(int argc, const char *argv[])
{
int y, m, d;
printf("Please input y:m:d\n");
scanf("%d:%d:%d", &y, &m, &d);
printf("%d:%d is %d of year %d!\n", m, d, dayofyear(y, m, d), y);
return 0;
}
int
main(void)
{
int iyear, imonth, idate;
int idays;
getinput(&iyear, &imonth, &idate);
idays = dayofyear(iyear, imonth, idate);
output(idays);
return 0;
}
static int dayofweek(int year,int month,int day)
{
int dow=0;
int x;
if(year<1899)
{
fprintf(stderr,"Sorry, day of week function is broken for year before 1899\n");
exit(-1);
}
/* Jan 1, 1899 is a sunday */
for(x=1899;x!=year;++x)
if(isleapyear(x)) dow+=2;
else dow+=1;
dow+=dayofyear(year,month,day);
return dow%7;
}
int ex5_8(){
int year, month, day;
year = 2013;
month = 4;
day = 14;
int numberofdays = dayofyear(year, month, day);
if(numberofdays > 0){
printf("\nThere have been %d days since the start of the year.\n", numberofdays);
int monthforp = 0;
int dayforp = 0;
monthday(year, numberofdays, &monthforp, &dayforp);
printf("\nYou gave me the year %d, so that means its the %d month and %d day.\n", year, monthforp, dayforp);
}
return 0;
}
