[英]First Day of the year Formula resulting in inconsistent results
目的是找到一年中的第一天 ,然后根據該天計算日歷和leap年。 我遇到的問題是; 雖然給了類一個公式(不能使用數組或函數),但在給定的幾年里我都能得到正確的結果,除非要計算周六 (模數后的余數為0)。
我的配方好嗎?
我將鏈接分解公式的頁面,當然也要提供我的頁面。
**這里是帶有公式的頁面:**
這是我的代碼公式:
//Calculating Dates:
//N = d + 2m + [3(m+1)/5] + y + [y/4] - [y/100] + [y/400] + 2
//N = 1 + 2(13) + [3(13+1)/5] + year_int + [year_int/4] - [year_int/100] +
//[year_int/400] + 2
// I'm using a hard-coded "13" to represent January in the place of m
day_one =
1 + 2*(13) + 3*(13 + 1)/5 + year_int + (year_int / 4) - (year_int / 100) + (year_int / 400) +
2;
day_one = day_one % 7;
if (day_one < 0 || day_one >= 7) {
printf("Invalid Day\n");
} else {
switch (day_one) {
case 1:
weekday = "Sunday";
printf("%s", weekday);
break;
case 2:
weekday = "Monday";
printf("%s", weekday);
break;
case 3:
weekday = "Tuesday";
printf("%s", weekday);
break;
case 4:
weekday = "Wednesday";
printf("%s", weekday);
break;
case 5:
weekday = "Thursday";
printf("%s", weekday);
break;
case 6:
weekday = "Friday";
printf("%s", weekday);
break;
case 0:
weekday = "Saturday";
printf("%s", weekday);
break;
default: printf("Error");
break;
}
}
我真的很感謝您的幫助,我只是在尋找指導。
謝謝!
我希望這一點更加清楚。 請查看帶有注釋的!!! 在函數內部
/*
ZELLER'S Algorithm
https://en.wikipedia.org/wiki/Zeller's_congruence
Gregorian calendar
*/
#include <stdio.h>
int day_of_week(int d,int m,int y);
int main(void)
{
int day,month,year;
printf ("Day, Month, Year\n");
scanf ("%d %d %d",&day,&month,&year);
printf("%d",day_of_week(day,month,year));
return 0;
}
int day_of_week(int d, int m, int y)
//This function returns the ISO number of the day for a given day,month,year
{
int day;
if (d<1 || d>31 || m<1 || m>12 || y<1583 ) return 0; // In that case we have major error!
if ((m==1) || (m==2))
{m=m+12;--y;} // You have to do this correction !!!!
day=d+(m+1)*26/10+y+y/4+6*(y/100)+y/400;
day=day % 7; // 0=Saturday 1=Sunday ...
day=((day+5) % 7)+1; // Convertion to ISO date: 1=Monday, 2=Tuesday ..
return (day);
}
我能夠弄清楚,找到第一年應該保留去年的整數。 然后,我回頭看了看書,意識到它是用純文本朗讀的。
捂臉
感謝您檢查您是否在這里!
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