C language programming perpetual calendar query program.

Experimental name: query and printing of perpetual calendar

Content: Design a program for querying and printing perpetual calendars.

Steps:

1. Draw the program flow chart;

2. Write a program;

3. Debugging the program, analyzing the problems in the debugging process, finding out the causes of the errors and making corrections;

4. Write the correct source program through debugging and modification.

Requirements:

1. After the program runs, first display the main menu on the screen:

1. Query what day it is today.

2. Inquire whether a year is a leap year.

3. Print the calendar of a certain year.

quit

2. After entering 1 in the main menu, the following will be displayed:

Please enter the year, month and day (XXXX, XX, XX).

Output after running: XX, XX and XXXX are week X. Do you want to continue the query (Y/N)?

If you enter y, "Please enter the year, month and day (XXXX, XX, XX)" will be displayed again, otherwise it will return to the main menu.

3. After entering 2 in the main menu, it will display:

"Please enter the year to check? (XXXX)”

Output after running: Yes (No) is a leap year in XXXX. Continue the query (Yes/No)?

If you enter y, it will be displayed again. "Please enter the year to check? (XXXX) ",otherwise return to the main menu.

4. After entering 3 in the main menu, it will display:

"Please enter the year to be printed (XXXX)"

After running, output XXXX calendar in the following format:

XXXX

X (number of months)

0 1 2 3 4 5 6

S M T W T F S

××× Year× Month× Day

xx xx xx xx xx xx

xx xx xx xx xx xx xx

xx xx xx xx xx xx xx

xx xx xx

X (number of months)

0 1 2 3 4 5 6

S M T W T F S

××××

x x x xxxx xx xx

xx xx xx xx xx xx xx

xx xx xx xx xx xx xx

xx xx xx xx xx

.

.

.

.

.

"Do you want to continue printing (Yes/No)?" It will be displayed after running.

If you enter y, "Please enter the year to be printed (XXXX)" will be displayed again, otherwise it will return to the main menu.

5. After entering 4 in the main menu, it will be displayed: "Do you really want to quit (Y/N)?"

If you enter y, the program ends, otherwise the main menu will be displayed again.

Tip:

1. Calculation of leap year: a leap year is a year that meets one of the following two requirements:

Divisible by 4, but not by 100;

Can be divisible by 4 or 400.

February in leap year is 29 days, and February in normal year is 28 days.

3. Calculation of day of the week:

s = X- 1+(X- 1)/4+(X- 1)/ 100+(X- 1)/400+C

X is the year, and C is the number of days from New Year's Day to today.

The remainder of S/7 is not just the number of weeks.

Example:1:198265438+February 26th.

Since 1982 is not a leap year (not divisible by 4), February of that year is 28 days.

c = 3 1+28+3 1+30+3 1+30+3 1+30+3 1+30+3 1+30+30+26 = 360

(days from 1 month to 1 1 month+/actual days in February)

s = 1982- 1+( 1982- 1)/4+( 1982- 1)/ 100+( 1982- 1)/400+360 = 282 1.3925

S/7 = 282 1/7 = 403 The remainder is 0, so this day is Sunday.

Example 2: March 8, 2000

Since 2000 was a leap year (divisible by 4, 100, 400), February of that year was 29 days.

C = 3 1+29+8 = 68( 1 days from month to February+actual days in March)

s = 2000- 1+(2000- 1)/4+(2000- 1)/ 100+(2000- 1)/400+68 = 255 1.757

S/7 = 255 1/7 = 364 The remainder is 3, so this day is Wednesday.