求某天是星期几

 /*====================================*/ | 求某天是星期几 /*====================================*/ #include<stdio.h> #include<stdlib.h> char * name[] = { "monday" , "tuesday" , "wednesday" , "thursday" , "friday" , "saturday" , "sunday" }; int main(void) { int d, m, y, a; printf("Day: "); scanf("%d",&d); printf("Month: "); scanf("%d",&m); printf("Year: "); scanf("%d",&y); //1月2月当做前一年的13,14月 if(m == 1 || m == 2){ m += 12; y--; } //判断是否咋1752年9月3日之前 if((y < 1752) || (y == 1752 && m < 9) || (y == 1752 && m == 9 && d < 3)) a = (d + 2*m + 3*(m+1)/5 + y + y/4 +5) % 7; else a = (d + 2*m + 3*(m+1)/5 + y + y/4 -y/100 + y/400) % 7; printf("it's a %s/n",name[a]); system("pause"); return 0; }