CSC-111 If statement examples and sample code

DayOfDate.java

import java.util.*;

public class DayOfDate {
	
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("Enter year: (e.g., 2008): ");
		int year = input.nextInt();

		System.out.print("Enter month: 1-12: ");
		int month = input.nextInt();
		if (month == 1)
		{
			month = 13;
			year = year - 1; // January is counted as month 13 of the previous
								// year.
		}
		else if (month == 2)
		{
			month = 14;
			year = year - 1; // February is counted as month 14 of the previous
								// year.
		}

		System.out.print("Enter the day of the month: 1-31: ");
		int dayOfMonth = input.nextInt();

		int j = year / 100;
		int k = year % 100;

		int dayOfWeek = (dayOfMonth + 26 * (month + 1) / 10 + k + k / 4 + j / 4 + 5 * j) % 7;

		if (dayOfWeek == 0)
			System.out.println("Day of the week is Saturday");
		else if (dayOfWeek == 1)
			System.out.println("Day of the week is Sunday");
		else if (dayOfWeek == 2)
			System.out.println("Day of the week is Monday");
		else if (dayOfWeek == 3)
			System.out.println("Day of the week is Tuesday");
		else if (dayOfWeek == 4)
			System.out.println("Day of the week is Wednesday");
		else if (dayOfWeek == 5)
			System.out.println("Day of the week is Thursday");
		else if (dayOfWeek == 6)
			System.out.println("Day of the week is Friday");
	}
}

NumberToMonth.java

import java.util.Scanner;

public class NumberToMonth {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.println("Enter number of month (1=January): ");
		int month = input.nextInt();
		input.close();
		
		if (month == 1)
			System.out.println("January");
		if (month == 2)
			System.out.println("February");
		if (month == 3)
			System.out.println("March");
		if (month == 4)
			System.out.println("April");
		if (month == 5)
			System.out.println("May");
		if (month == 6)
			System.out.println("June");
		if (month == 7)
			System.out.println("July");
		if (month == 8)
			System.out.println("August");
		if (month == 9)
			System.out.println("September");
		if (month == 10)
			System.out.println("October");
		if (month == 11)
			System.out.println("November");
		if (month == 12)
			System.out.println("December");
	}
}

NumberToMonth2.java

import java.util.Scanner;

public class NumberToMonth2 {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("Enter number of month (1=January): ");
		int month = input.nextInt();
		input.close();
		
		String strMonth = "Illegal Month";
		if (month == 1)
			strMonth = "January";
		if (month == 2)
			strMonth = "February";
		if (month == 3)
			strMonth = "March";
		if (month == 4)
			strMonth = "April";
		if (month == 5)
			strMonth = "May";
		if (month == 6)
			strMonth = "June";
		if (month == 7)
			strMonth = "July";
		if (month == 8)
			strMonth = "August";
		if (month == 9)
			strMonth = "September";
		if (month == 10)
			strMonth = "October";
		if (month == 11)
			strMonth = "November";
		if (month == 12)
			strMonth = "December";
		System.out.println("Month = " + strMonth);
	}
}

NumberToMonth3.java

import java.util.Scanner;

public class NumberToMonth3 {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("Enter number of month (1=January): ");
		int month = input.nextInt();
		input.close();
		
		String strMonth;
		int days;
		if (month == 1) {
			strMonth = "January";
		    days = 31; 
		}
		else if (month == 2) {
			strMonth = "February";
			days = 28;
		}
		else if (month == 3) {
			strMonth = "March";
			days = 31;
		}
		else if (month == 4) {
			strMonth = "April";
			days = 30;
		}
		else if (month == 5) {
			strMonth = "May";
			days = 31;
		}
		else if (month == 6) {
			strMonth = "June";
			days = 30;
		}
		else if (month == 7) {
			strMonth = "July";
			days = 31;
		}
		else if (month == 8) {
			strMonth = "August";
			days = 31;
		}
		else if (month == 9) {
			strMonth = "September";
		    days = 31;
		}
		else if (month == 10) {
			strMonth = "October";
		    days = 31;
		}
		else if (month == 11) {
			strMonth = "November";
			days = 30;
		}
		else if (month == 12) {
			strMonth = "December";
			days = 31;
		}
		else {
			strMonth = "Illegal Month";
			days = 0;
		}
		if (days == 0) {
			System.out.println(strMonth);
		}
		else {
			System.out.printf("%s has %d days", strMonth, days);
		}
	}
}

NumberToMonth4.java

import java.util.Scanner;

public class NumberToMonth4 {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("Enter number of month (1=January): ");
		int month = input.nextInt();
		input.close();
		
		String strMonth;
		if (month == 1)
			strMonth = "January";
		else if (month == 2)
			strMonth = "February";
		else if (month == 3)
			strMonth = "March";
		else if (month == 4)
			strMonth = "April";
		else if (month == 5)
			strMonth = "May";
		else if (month == 6)
			strMonth = "June";
		else if (month == 7)
			strMonth = "July";
		else if (month == 8)
			strMonth = "August";
		else if (month == 9)
			strMonth = "September";
		else if (month == 10)
			strMonth = "October";
		else if (month == 11)
			strMonth = "November";
		else if (month == 12)
			strMonth = "December";
		else
			strMonth = "Illegal Month";
		System.out.println("Month = " + strMonth);
	}
}

Palindrome.java

import java.util.Scanner;

public class Palindrome {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);

		System.out.print("Enter a three-digit integer: ");
		int number = input.nextInt();
		
		if (number >= 100 && number <= 999) {  // && AND Both arguments must be TRUE 
			int lsd = number % 10;
			int msd = number / 100;
			if (lsd == msd)
				System.out.println("Palindrome!!!");
			else
				System.out.println("NO Palindrome");
		}
		else {
			System.out.println("Not a 3 Digit Integer.");
		}

		
		
		if (number < 100 || number > 999)   // OR means one or the other must be TRUE
			System.out.println("Not a 3 Digit Integer.");
		else {
			int lsd = number % 10;
			int msd = number / 100;
			if (lsd == msd)
				System.out.println("Palindrome!!!");
			else
				System.out.println("NO Palindrome");
		}

		input.close();

	}

}

PickACardWithIF.java

public class PickACardWithIF {

	public static void main(String[] args) {
		int card = (int)(52 * Math.random());
		int suit = card / 13;
		int rank = card % 13;
		
		String strRank;
		if (rank == 0) 
			strRank = "Ace";
		else if (rank >= 1 && rank <= 9)
			strRank = "" + (rank + 1);
		else if (rank == 10)
			strRank = "Jack";
		else if (rank == 11)
			strRank = "Queen";
		else
			strRank = "King";

		String strSuit;
		if (suit == 0)
			strSuit = "Spades";
		else if (suit == 1)
			strSuit = "Hearts";
		else if (suit == 2)
			strSuit = "Clubs";
		else
			strSuit = "Diamonds";
		
		System.out.println(strRank + " of " + strSuit);

	}

}

PickACardWithSwith.java

public class PickACardWithSwith {

	public static void main(String[] args) {
		int card = (int)(52 * Math.random());
		int suit = card / 13;
		int rank = card % 13;
		
		String strRank = "";
		switch (rank) {
		case 0: 
			strRank = "Ace";
			break;
		case 1:
		case 2:
		case 3:
		case 4:
		case 5:
		case 6:
		case 7:
		case 8:
		case 9:
			strRank = "" + (rank + 1);
			break;
		case 10:
			strRank = "Jack";
			break;
		case 11:
			strRank = "Queen";
			break;
		case 12:
			strRank = "King";
			break;
		}

		String strSuit = "";
		switch (suit) {
		case 0:
			strSuit = "Spades";
			break;
		case 1:
			strSuit = "Hearts";
			break;
		case 2:
			strSuit = "Clubs";
			break;
		case 3:
			strSuit = "Diamonds";
			break;
		}

		System.out.println(strRank + " of " + strSuit);
	}

}

Quadratic.java

import java.util.Scanner;

public class Quadratic {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);

		System.out.print("Enter a, b, c: ");
		double a = input.nextDouble();
		double b = input.nextDouble();
		double c = input.nextDouble();
		
		if (a == 0) {
			System.out.println("Sorry.  a == 0 You don't have a quadratic.");
		}
		else {
			double discriminant = b * b - 4 * a * c;
			if (discriminant < 0) {
				System.out.println("The equation has no real roots");				
			}
			else if (discriminant == 0) {
				double r = -b / (2 * a);
				System.out.println("The equation has one root " + r);				
			}
			else {
				double r1 = (-b + Math.sqrt(discriminant) / (2 * a));
				double r2 = (-b - Math.sqrt(discriminant) / (2 * a));
				System.out.println("The equation has two roots " + r1 + " and " + r2);
			}
		}
		
		input.close();
	
	}

	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	public static void mainxxx(String[] args) {
		Scanner input = new Scanner(System.in);

		System.out.print("Enter a, b, c: ");
		double a = input.nextDouble();
		double b = input.nextDouble();
		double c = input.nextDouble();

		double discriminant = b * b - 4 * a * c;

		if (discriminant < 0)
		{
			System.out.println("The equation has no real roots");
		}
		else if (discriminant == 0)
		{
			double r1 = -b / (2 * a);
			System.out.println("The equation has one root " + r1);
		}
		else
		{ // (discriminant > 0)
			double r1 = (-b + Math.pow(discriminant, 0.5)) / (2 * a);
			double r2 = (-b - Math.pow(discriminant, 0.5)) / (2 * a);
			System.out.println("The equation has two roots " + r1 + " and " + r2);
		}
	}
}

RandomMonth.java

import java.util.Scanner;

public class RandomMonth {
	public static void main(String[] args) {
		int number = (int)(12 * Math.random()) + 1;  // 1 .. 12
		Scanner input = new Scanner(System.in);
		System.out.println("Enter number: ");
		number = input.nextInt();
		

		switch (number) {
		case 1:
		case -1:
			System.out.println("January");
			break;
		case 2:
		case -2:
			System.out.println("Feburary");
			break;
		case 3:
			System.out.println("March");
			break;
		case 4:
			System.out.println("April");
			break;
		case 5:
			System.out.println("May");
			break;
		case 6:
			System.out.println("June");
			break;
		case 7:
			System.out.println("July");
			break;
		case 8:
			System.out.println("August");
			break;
		case 9:
			System.out.println("September");
			break;
		case 10:
			System.out.println("October");
			break;
		case 11:
			System.out.println("November");
			break;
		case 12:
			System.out.println("December");
			break;
		default:
			System.out.println("Bad Month");
			break;			
		}

		
		
		
		
		/*
		if (number == 1) {
			System.out.println("January");
			System.out.println("It's cold");
		}
		else if (number == 2) {
			System.out.println("Feburary");
		}
		else if (number == 3)
			System.out.println("March");
		else if (number == 4)
			System.out.println("April");
		else if (number == 5)
			System.out.println("May");
		else if (number == 6)
			System.out.println("June");
		else if (number == 7)
			System.out.println("July");
		else if (number == 8)
			System.out.println("August");
		else if (number == 9)
			System.out.println("September");
		else if (number == 10)
			System.out.println("October");
		else if (number == 11)
			System.out.println("November");
		else if (number == 12)
			System.out.println("December");
		else
			System.out.println("Bad Month");
*/
		
	}

	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	public static void mainxxx(String[] args) {
		int number = (int) (Math.random() * 12) + 1;

		// or int number = (int)(System.currentTimeMillis() % 12 + 1);

		// or int number = (int)(Math.random() * 12) + 1;

	}
}

Sort3Numbers1.java

import java.util.Scanner;

public class Sort3Numbers1 {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("Enter 3 numbers: ");
		int numb1 = input.nextInt();
		int numb2 = input.nextInt();
		int numb3 = input.nextInt();
		
		if (numb1 > numb2) {
			int temp = numb1;
			numb1 = numb2;
			numb2 = temp;
		}
		
		if (numb2 > numb3) {
			int temp = numb2;
			numb2 = numb3;
			numb3 = temp;
		}
		
		if (numb1 > numb2) {
			int temp = numb1;
			numb1 = numb2;
			numb2 = temp;
		}
		
		System.out.printf("Sorted numbers: %d %d %d\n", numb1, numb2, numb3);

	}

}

Sort3Numbers2.java

import java.util.Scanner;

public class Sort3Numbers2 {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("Enter 3 numbers: ");
		int numb1 = input.nextInt();
		int numb2 = input.nextInt();
		int numb3 = input.nextInt();
		
		if (numb1 > numb2) {
			int temp = numb1;
			numb1 = numb2;
			numb2 = temp;
		}
		
		if (numb1 > numb3) {
			int temp = numb1;
			numb1 = numb3;
			numb3 = temp;
		}
		
		if (numb2 > numb3) {
			int temp = numb2;
			numb2 = numb3;
			numb3 = temp;
		}
		
		System.out.printf("Sorted numbers: %d %d %d\n", numb1, numb2, numb3);

	}

}

WindChill.java

import java.util.Scanner;

public class WindChill {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		// Enter the temperature in Fahrenheit
		System.out.print("Enter the temperature in Fahrenheit: ");
		double fahrenheit = input.nextDouble();

		if (fahrenheit < -58 || fahrenheit > 41) {
			System.out.println("Temperature must be between -58�F and 41�F");
		}
		else {
			// Enter the wind speed miles per hour
			System.out.print("Enter the wind speed miles per hour: ");
			double speed = input.nextDouble();

			if (speed < 2)
			{
				System.out.println("Speed must be greater than or equal to 2");
			}
			else {
				// Compute wind chill index
				double windChillIndex = 35.74 + 0.6215 * fahrenheit - 35.75 * Math.pow(speed, 0.16)
						+ 0.4275 * fahrenheit * Math.pow(speed, 0.16);

				// Display the result
				System.out.println("The wind chill index is " + windChillIndex);
			}
		}
	}

	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	public static void mainxxx(String[] args) {
		java.util.Scanner input = new java.util.Scanner(System.in);
		// Enter the temperature in Fahrenheit
		System.out.print("Enter the temperature in Fahrenheit: ");
		double fahrenheit = input.nextDouble();

		if (fahrenheit < -58 || fahrenheit > 41)
		{
			System.out.println("Temperature must be between -58�F and 41�F");
			System.exit(1);
		}

		// Enter the wind speed miles per hour
		System.out.print("Enter the wind speed miles per hour: ");
		double speed = input.nextDouble();

		if (speed < 2)
		{
			System.out.println("Speed must be greater than or equal to 2");
			System.exit(2);
		}

		// Compute wind chill index
		double windChillIndex = 35.74 + 0.6215 * fahrenheit - 35.75 * Math.pow(speed, 0.16)
				+ 0.4275 * fahrenheit * Math.pow(speed, 0.16);

		// Display the result
		System.out.println("The wind chill index is " + windChillIndex);
	}
}