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Answer correctly

0 votes
asked Oct 8, 2018 by Christina1 (240 points)

Write a program that asks the user to enter the month (letting the user enter an integer in the range of 1 through 12) and the four-digit year. The program should then display the number of days in that month. Use the following criteria to identify leap years:

  1. Determine whether the year is divisible by 100. If it is, then it is a leap year if and only if it is divisible by 400. For example, 2000 is a leap year but 2100 is not.
  2. If the year is not divisible by 100, then it is a leap year if and only if the year is divisible by 4. For example, 2008 is a leap year but 2009 is not.

More examples:
The following years are not leap years: 1700, 1800, 1900, 2100, 2200, 2300, 2500, 2600
The following years are leap years: 1600, 2000, 2400

The output should look something like this:
Enter a month (1-12): 2
Enter a year: 2016
29 days

1 Answer

0 votes
answered Oct 11, 2018 by Lukas (540 points)
its in german but you can translate it at your own

int main()

{

int jahr,monat,tage;

printf("\nBitte Jahr eingeben: ");
    scanf("%i",&jahr);
    printf("\nBitte Monat eingeben: ");
    scanf("%i",&monat);
    printf("\nBitte Tag eingeben: ");
    scanf("%i",&tage);
    if (monat>=1 && monat <=12 && jahr > 1582) {
        switch (monat) {
            case 2:
            if (!((jahr%100)%4) && (jahr%100)
            || !(jahr%400))
            tage = 29;
            else
            tage = 28;
            break;
            case 2*2:
            case 6:
            case 9: case 11:
            tage = 30;
            break;
            default:
            tage = 31;
        }
        printf("\n%i hat der Monat %i %i Tage", jahr, monat, tage);
    }
    
    else
    printf("\nFalsche Datumsangaben!");

}
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