jsquared21 / intro-to-java-programming Goto Github PK

import java.util.Scanner;

/**
 * Created by SquirrelCoder on 29-Jan-17.
 */
public class ZellerAlgorithm {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        // getting user input
        System.out.print("Enter full year (e.g., 2012): ");
        int year = input.nextInt();
        System.out.print("Enter month as number between 1 and 12: ");
        int month = input.nextInt();

        // check user input
        if (!checkMonth(month)) {
            System.exit(0);
        }

        // print the calendar header
        printCalendarHeader(month, year);

        // print the calendar first day
        printFirstDay(month, year);

        // print the calendar itself
        printCalendarItself(month, year);

    }

    public static int weekDay(int day, int month, int year) {
        if (month == 1 || month == 2) {
            month = month + 12;
            year--;
        }
        int q, m, k, j, h;
        q = day;
        m = month;
        k = year % 100;
        j = (int) (year / 100.0);
        h = (q + (int) ((13 * (m + 1)) / 5.0) + k + (int) (k / 4.0) + (int) (j / 4.0) + (5 * j)) % 7;
        return h;
    }

    public static boolean isLeapYear(int year) {
        return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);
    }

    public static void printCalendarHeader(int month, int year) {
        switch (month) {
            case 1:
                System.out.print("\t\tJanuary\t");
                System.out.println(year);
                System.out.println("---------------------------");
                break;
            case 2:
                System.out.print("\t\tFebruary\t");
                System.out.println(year);
                System.out.println("---------------------------");
                break;
            case 3:
                System.out.print("\t\tMarch\t");
                System.out.println(year);
                System.out.println("---------------------------");
                break;
            case 4:
                System.out.print("\t\tApril\t");
                System.out.println(year);
                System.out.println("---------------------------");
                break;
            case 5:
                System.out.print("\t\tMay\t");
                System.out.println(year);
                System.out.println("---------------------------");
                break;
            case 6:
                System.out.print("\t\tJune\t");
                System.out.println(year);
                System.out.println("---------------------------");
                break;
            case 7:
                System.out.print("\t\tJuly\t");
                System.out.println(year);
                System.out.println("---------------------------");
                break;
            case 8:
                System.out.print("\t\tAugust\t");
                System.out.println(year);
                System.out.println("---------------------------");

                break;
            case 9:
                System.out.print("\t\tSeptember\t");
                System.out.println(year);
                System.out.println("---------------------------");
                break;
            case 10:
                System.out.print("\t\tOctober\t");
                System.out.println(year);
                System.out.println("---------------------------");
                break;
            case 11:
                System.out.print("\t\tNovember\t");
                System.out.println(year);
                System.out.println("---------------------------");
                break;
            case 12:
                System.out.print("\t\tDecember\t");
                System.out.println(year);
                System.out.println("---------------------------");
                break;


        }
        System.out.println("Sun\tMon\tTue\tWed\tThu\tFri\tSat");
    }

    public static int lastDayOfMonth(int month, int year) {
        int lastDayOfMonth;
        if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
            lastDayOfMonth = 31;
        } else if (month == 2) {
            if (isLeapYear(year)) {
                lastDayOfMonth = 29;
            } else {
                lastDayOfMonth = 28;
            }
        } else {
            lastDayOfMonth = 30;
        }
        return lastDayOfMonth;
    }

    public static boolean checkMonth(int month) {
        if (month > 12 || month < 0) {
            System.out.println("Invalid Month!");
            return false;
        }
        return true;
    }

    public static void printFirstDay(int month, int year) {
        int firstDay = weekDay(1, month, year);
        switch (firstDay) {
            case 0:
                System.out.print("\t\t\t\t\t\t1");
                break;
            case 1:
                System.out.print("1");
                break;
            case 2:
                System.out.print("\t1");
                break;
            case 3:
                System.out.print("\t\t1");
                break;
            case 4:
                System.out.print("\t\t\t1");
                break;
            case 5:
                System.out.print("\t\t\t\t1");
                break;
            case 6:
                System.out.print("\t\t\t\t\t1");
                break;

        }
        System.out.print("\t");
    }

    public static void printCalendarItself(int month, int year) {

        // find out the last day of that month
        // whether it's 28/29/30/31 days
        int lastDayOfMonth = lastDayOfMonth(month, year);

        // print the calendar itself
        for (int i = 2; i <= lastDayOfMonth; i++) {
            int printedDay = weekDay(i, month, year);
            if (printedDay == 1) {
                System.out.println();
            }
            System.out.print(i + "\t");
        }
    }
}

Course course1 = new Course("Data Structure");

course1.addStudent("Peter Jones");
course1.addStudent("Kim Smith");
course1.addStudent("Anne Kennedy");
course1.addStudent("Steve Boss");

System.out.println("Nmuber of students in course1: " + course1.getNumberOfStudents());
String[] students = course1.getStudents();
for (int i = 0; i < course1.getNumberOfStudents(); i++) {
  System.out.print(students[i] + ", ");
}
System.out.println();
course1.dropStudent("Peter Jones");
for (int i = 0; i < course1.getNumberOfStudents(); i++) {
  System.out.print(students[i] + ", ");
}

public static void sort(int[] list) {
    int nCompare = 0;
		for (int i = 0; i < list.length - 1; i++) {
			int min = list[i];
			int minIndex = i;

			for (int j = i + 1; j < list.length; j++) {
				nCompare++;
				if (list[j] < min) {
					min = list[j];
					minIndex = j; 
				}					
			}

			if (minIndex != i) {
				list[minIndex] = list[i];
				list[i] = min;
			}
		}
		System.out.println("Total compares: " + nCompare);
	}
}

			System.out.print(year + (count % 10 == 0 ? "\n" : " "));

public static boolean isValid(double side1, double side2, double side3) {
        return side1 + side2 > side3 && side1 + side3 > side2 && side2 + side3;
    }

System.out.println(calender.get(calender.MONTH) + "/" +
       calender.get(calender.DAY_OF_MONTH) + "/" + calender.get(calender.YEAR));

 System.out.println(calendar.get(GregorianCalendar.MONTH) + "/" + 
      calendar.get(GregorianCalendar.DAY_OF_MONTH) + 
       "/" + calendar.get(GregorianCalendar.YEAR));

protected void run() {
		if (minute == 59)
			hour = hour + 1; 

		if (second == 59) 
		  minute = minute + 1;

		second = second < 59 ? second + 1 : 0;

		text.setText(getTime());
}

protected void run() {
        if(min == 59 && sec == 59) {
            hour++;
            min = 0;
            sec = 0;
        }
        if(sec == 59 && min != 59) {
            min++;    
        }
        sec = (sec < 59 ? sec + 1 : 0);
        text.setText(getTime());
}

public static void main(String[] args) {
	// TODO Auto-generated method stub
	System.out.println(4 * ( 1.0 - (1.0 / 3) + (1.0 / 5) - (1.0 / 7) + (1.0 / 9) - (1.0 / 11)));
	System.out.println(4 * ( 1.0 - (1.0 / 3) + (1.0 / 5) - (1.0 / 7) + (1.0 / 9) - (1.0 / 11) + (1.0 / 13)));
}

    public static void main(String[] args) {
        // Scissor (0)
        // Rock (1)
        // Paper (2)
        Scanner input = new Scanner(System.in);

        int computerItem;
        int numOfComputerWon = 0;
        int numOfHumanWon = 0;

        while (true) {
            System.out.print("Number of Your Points: " + numOfHumanWon);
            System.out.print("\nNumber of Computer Points: " + numOfComputerWon);
            System.out.println();
            System.out.println();
            System.out.print("The Computer is: ");
            computerItem = (int) (Math.random() * 3);
            switch (computerItem) {
                case 0:
                    System.out.print("Scissor");
                    break;
                case 1:
                    System.out.print("Rock");
                    break;
                case 2:
                    System.out.print("Paper");
                    break;
            }
            System.out.println();
            System.out.print("Scissor (0), Rock (1), Paper (2): ");
            int humanItem = input.nextInt();
            System.out.print("You are ");
            switch (humanItem) {
                case 0:
                    System.out.print("Scissor");
                    break;
                case 1:
                    System.out.print("Rock");
                    break;
                case 2:
                    System.out.print("Paper");
                    break;
            }

            System.out.println();

            if (humanItem == 0 && computerItem == 2) {
                numOfHumanWon++;
                System.out.print("You Won! 1 Point for You!");
            } else if (humanItem == 2 && computerItem == 0) {
                numOfComputerWon++;
                System.out.print("You Lost! 1 Point for Computer!");
            } else if (humanItem == 1 && computerItem == 0) {
                numOfHumanWon++;
                System.out.print("You Won! 1 Point for You!");
            } else if (humanItem == 0 && computerItem == 1) {
                numOfComputerWon++;
                System.out.print("You Lost. 1 Point for Computer!");
            } else if (humanItem == 2 && computerItem == 1) {
                numOfComputerWon++;
                numOfHumanWon++;
                System.out.print("You Won! 1 Point for You!");
            } else if (humanItem == 1 && computerItem == 2) {
                numOfComputerWon++;
                System.out.print("You Lost! 1 Point for Computer!");
            } else {
                System.out.print("Draw! Again.");
            }
            System.out.println();
            if (numOfComputerWon - numOfHumanWon >= 2) {
                System.out.print("Computer has " + (numOfComputerWon - numOfHumanWon) + " Points more than you.");
                System.out.print("\nYou Lost. Maybe Next Time!");
                break;
            }
        }
    }

        if ( first.compareTo(second) > 0) {
            temp = first;
            first = second;
            second = temp;
        }

        if( first.compareTo(third) > 0) {
            temp = first;
            first = third;
            third = temp;
        }

        if( second.compareTo(third) > 0 ) {
            temp = second;
            second = third;
            third = temp;
        }

public class Num_14_Euclid_Algo {
    public static void main(String[] args) {
        java.util.Scanner input = new java.util.Scanner(System.in);
        int[] userNumbers = new int[5];

        for (int i = 0; i < userNumbers.length; i++) {
            userNumbers[i] = input.nextInt();
        }

        System.out.println("GCD is: " + gcdOfMultipleNumbers(userNumbers));

    }

    public static int euclidAlgorithm(int a, int b) {
        int remainder = a % b;
        int quotient = 0;
        while (remainder != 0) {
            a = b;
            b = remainder;
            remainder = a % b;
            quotient = b;
        }
        return quotient;
    }

    public static int gcdOfMultipleNumbers(int... array) {
        int gcd = array[0];
        for (int i = 1; i < array.length; i++) {
            gcd = euclidAlgorithm(gcd, array[i]);
        }
        return gcd;
    }
}

if ((hexChar-'0'<0||hexChar-'9'>0)&&(hexChar-'A'<0||hexChar-'F'>0)) throw new NumberFormatException (
	    		  "Not a hex number!");