Zellerの公式 曜日を求めるプログラム #include <stdio.h> int main(int argc, char const *argv[]) { int year; int month; int day; int week_of_day; year = 2019; month = 10; day = 2; week_of_day = (year + year / 4 - year / 100 + year / 400 + (13 * month </stdio.h>…