Question

So the user enters the year + it tells whether or not it is a leap year.. but now i need help getting the DAY of the week to pop up when it IS a leap year.

# include <math.h>
# include <stdio.h>

int main (void)
{
    int yearEntered;

    printf("Enter a year: ");

    int read = scanf("%d", &yearEntered);

    if (read == 0 )
    {
        printf("Bad input: requires an integer");
    }
    else if (yearEntered%4==0 && yearEntered%100!=0 || yearEntered%400==0)
    {
        printf("%04d is a leap year and February 29th is on a \n",yearEntered, dayString);

    // Not so sure about this switch statement......
    switch (DayOfWeek)
    {
        case 0:
        {
            dayString("Sunday");
            break;
        }
        case 1:
        {
            dayString("Monday");
            break;
        }
        case 2:
        {
            dayString("Tuesday");
            break;
        }
        case 3:
        {
            dayString("Wednesday");
            break;
        }
        case 4:
        {
            dayString("Thursday");
            break;
        }
        case 5:
        {
            dayString("Friday");
            break;
        }
        case 6:
        {
            dayString("Saturday");
            break;
        }
        default:
        {
            dayString("");
        }

    }

    else if (yearEntered < 1752)
    {
        printf("%04d is not a 4 digit year after 1752.",yearEntered);
    }
    else
    {
        printf("%d is not a leap year.\n",yearEntered);
    }

    return 0;
}

Answer 1

If your problem were only about the day of week for Feb 29th, you’d just have to compute day of week for Feb 28th and increment it (modulo seven of course).

But I guess that your problem is to find day of week, no matter which particular day.

In that case, you may be interested in what Wikipedia has to say: Determination of the day of the week.