CODEWITHSUNDEEP
java
Amr Mixy
Amr Mixy

Reputation: 83

Calculate day of the week error

I have wrote this program and the output isn't working. Could you please help me identify where the error is? I have to use this code not any other from the internet, as we have to construct it from what we understood from the lesson. I am using jgrasp. 

----jGRASP exec: javac -g samooras.java

the error I get is 

samooras.java:25: error: incompatible types: int cannot be converted to String[]
                  -2*(year/100))%7+7)%7+1;
                                       ^
1 error

 ----jGRASP wedge2: exit code for process is 1.

Code:

import java.util.Scanner;

public class samooras {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String[] dayoftheweek = {"Sat", "Sun", "Mon", "Tues", "Wed", "Thur", "Fri"};
        int year = input.nextInt();
        int month = input.nextInt();
        int day = input.nextInt();
        dayoftheweek = ((day +
                         (13 * ((month + 9) % 12 + 1) - 1) / 5
                         + year % 100
                         + year % 100 / 4
                         + year / 400
                         - 2 * (year / 100)) % 7 + 7) % 7 + 1;
        System.out.println("the day of the week is: " + dayoftheweek);
    }
}

Upvotes: 1

Views: 105

Answers (2)

BlackHatSamurai
BlackHatSamurai

Reputation: 23483

Assuming that you are using that formula to get the day of the week from the array you created, in which you would do:

import java.util.Scanner;

public class samooras {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String[] dayoftheweekArray = {"Sat", "Sun", "Mon", "Tues", "Wed", "Thur", "Fri"};
        int year = input.nextInt();
        int month = input.nextInt();
        int day = input.nextInt();
        int dayoftheweekNumber = ((day + 
                                   (13 * ((month + 9) % 12 + 1) - 1) / 5
                                   + year % 100
                                   + year % 100 / 4
                                   + year / 400
                                   - 2 * (year / 100)) % 7 + 7) % 7 + 1;
        String dayoftheweek = dayoftheweekArray[dayoftheweekNumber]; 
        System.out.println("the day of the week is: " + dayoftheweek);
    }
}

Upvotes: 4

Richard
Richard

Reputation: 527

When you define:

String[] dayoftheweek={"Sat","Sun","Mon","Tues","Wed","Thur","Fri"};

dayoftheweek is an array (that what the [] means). An array contains multiple values of the same type (in this case String). To access an element of the array we use an index(for example dayoftheweek[0] is the String "Sat").

So when you say:

dayoftheweek=((day+ ...

you are computing the index of the day of week in your "dayoftheweek" array.
First of all you can't use the same name so, you should have something like:

int dayIndex = ((day+ ...

Once you have the index, you need to apply it to the array in order to get the actual day of week String:

System.out.println("the day of the week is: " + dayoftheweek[dayIndex]);

Upvotes: 1

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