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- #include <stdio.h>
- /*
- * 基姆拉尔森计算公式
- * W= (d+2*m+3*(m+1)/5+y+y/4-y/100+y/400) mod 7
- */
- int week(int y, int m, int d)
- {
- if (m < 3) {
- m += 12;
- y--;
- }
- int w = (d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 - y / 100 + y / 400) % 7;
- return w;
- }
- int main()
- {
- printf("%d\n", week(2015, 4, 16)); // => 3 星期四
- printf("%d\n", week(1989, 2, 3)); // => 4 星期五
- return 0;
- }
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