>>57
#include<stdio.h>
int main() {
int year,months,day;
int sum,i;
int m_array[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
char*cweek[7] = {"日","月","火","水","木","金","土"};
sum =0;
printf ("input (e.g. ****/**/**)\n>>");
scanf ("%d/%d/%d",&year,&months,&day);

/*閏年の判定*/
for(i=1;i<year;i++){
if((year%4==0)&&((year%100!=0))||(year%400==0)){
sum++;
i++;
}
year--;

/*前月までの日数*/
for (i =0; i < months-1; i++) {
sum += m_array[i];
}

year++;

sum=sum+day;
//曜日の出力
printf("%s曜日",cweek[sum%7]);
return 0;
}
}