Introduction - If you have any usage issues, please Google them yourself
Procedures for the preparation of the calendar, enter the month of the year after the calendar month in the form of output. Main functions can be realized as follows: 1. May the year entered by the user to determine the legality of the data, 1900 ≤ year ≤ 2100,1 ≤ month ≤ 12, the year the string into a binary number stored in the variable year, month, otherwise an error 2. to determine leap year leap, modify monthday: leap year to February the number of days to 29, otherwise 28. Calculate a few days each month, 1 month of the week. 3. Display output calendar, users continue to query, then returns to re-enter the month of the year, otherwise the exit end of the program.