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Author: xXnikosXx

Dieretes.java

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+package MyFirstPackage;
+
+import java.util.Scanner;
+
+public class Dieretes {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner sc = new Scanner(System.in);
+		int D;
+		int O;
+		int x;
+		int counter = 0;
+		System.out.println("Εισάγετε τιμή για τον διαιρέτη.");
+		D = sc.nextInt();
+		System.out.println("Εισάγετε τιμή για το όριο των διαιρετέων.");
+		O = sc.nextInt();
+		
+		for(int i = D; i <= O; i++ ){
+			x = i % D;
+			if(x == 0) {
+				System.out.print(i +"  ");
+				counter += 1;
+			
+			}
+		}
+		if(counter == 0) {
+			System.out.println("Δεν υπάρχουν διαιρέτες.");
+		}
+		sc.close();
+	}
+
+}

E1.java

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+/*
+ * 1. Write a Java program to print 'Hello' on screen and then print your name on a separate line.
+Expected Output :
+Hello
+Alexandra Abramov
+*/
+
+package w3resourceExcersises;
+
+import java.util.Scanner;
+
+public class E1 {
+
+	public static void main(String[] args) {
+		
+		String firstName; // Declare string variable for first name.
+		String lastName; // Declare string variable for last name
+		Scanner sc = new Scanner(System.in); // creates scanner to receive input of first and last name.
+		
+		System.out.println("Please, enter your first name..."); // Asks for input of first name.
+		firstName = sc.nextLine(); // Saves first name to firstName string using scanner(sc) for later use.
+		
+		System.out.println("Please, enter your last name..."); //Asks for input of last name.
+		lastName = sc.nextLine(); // Saves last name to lastName string using scanner(sc) for later use.
+		
+		System.out.println("Hello"); // Prints Hello
+		System.out.println(firstName + " " + lastName); // Prints: firstname lastname.
+		
+		sc.close(); // Closes Scanner (sc) to prevent resource leak.
+		
+	}
+
+}

E11.java

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+/*
+ * 11. Write a Java program to print the area and perimeter of a circle.
+Test Data:
+Radius = 7.5
+Expected Output
+Perimeter is = 47.12388980384689
+Area is = 176.71458676442586 
+ */
+package w3resourceExcersises;
+
+import java.util.Scanner;
+
+public class E11 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		Scanner sc = new Scanner(System.in);
+		
+		System.out.println("Enter a circle radius (in cm) to calculate it's perimeter and area..");
+		double radius = sc.nextDouble();
+		
+		double perimeter = ( 2 * Math.PI * radius);
+		double area = ( Math.PI * ( radius * radius) );
+		
+		System.out.println("The circle with a radius of " + radius + "cm has a perimeter of " + perimeter + "cm and an area of " + area + "cm.");
+		
+		sc.close();
+	}
+
+}

E12.java

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+/*
+ * Write a Java program that takes three numbers as input to calculate and print the average of the numbers. 
+ */
+package w3resourceExcersises;
+
+import java.util.Scanner;
+
+public class E12 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		Scanner sc = new Scanner(System.in);
+		
+		System.out.println("Enter 3 numbers to calculate their average..");
+		double numA = sc.nextDouble();
+		double numB = sc.nextDouble();
+		double numC = sc.nextDouble();
+		
+		double sum = ( numA + numB + numC ) ;
+		
+		double avg = ( sum / 3 );
+		
+		System.out.println("The average of the 3 numbers entered is: " + avg + " .");
+		
+		sc.close();
+		
+	}
+
+}

E12pro.java

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+/*
+ * Original: Write a Java program that takes three numbers as input to calculate and print the average of the numbers. 
+ * 
+ * Mine (pro): Write a Java program that takes an unknown amount of numbers as input to calculate and print their average. 
+ */
+package w3resourceExcersises;
+
+import java.util.Scanner;
+
+public class E12pro {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		Scanner sc = new Scanner(System.in);
+		
+		System.out.println("Start inputing numbers to calculate their average. Input 0 to terminate the input stream and get the output.");
+		double numX = sc.nextDouble();
+		double sum = numX;
+		int i = 0;
+		
+		while (numX != 0) {
+			System.out.println("Insert next number...");
+			numX = sc.nextDouble();
+			sum = sum + numX;
+			i++;
+		};
+		
+		double avg = (sum / i);
+		System.out.println("The average of the inputed numbers( which were " + i + " in total ) is: " + avg +" .");
+		
+		sc.close();
+	}
+
+}

E13.java

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+/*
+ * 
+ * Something's wrong, I can feel it... (delete line 41 to get rid of error once excersise is solved properly)
+ * 
+ * 
+ * Write a Java program to print the area and perimeter of a rectangle.
+Test Data:
+Width = 5.5 Height = 8.5
+
+Expected Output
+Area is 5.6 * 8.5 = 47.60
+Perimeter is 2 * (5.6 + 8.5) = 28.20 
+ */
+package w3resourceExcersises;
+
+import java.util.Scanner;
+
+public class E13 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		Scanner sc = new Scanner(System.in);
+		
+		System.out.println("Enter the width of the rectangle of which you wish to calculate the area and perimeter..");
+		final double width = sc.nextDouble();
+		
+		System.out.println("Enter the height of the rectangle of which you wish to calculate the area and perimeter..");
+		final double height = sc.nextDouble();
+		
+		double area = ( width * height ) ;
+		double perimeter = 2 * ( width + height );
+		
+		System.out.println("The rectangle's area is: " + width + " * " + height + " = " + area + " .");
+		System.out.println("The rectangle's perimeter is: 2 * ( " + width + " + " + height + " ) = " + perimeter + " .");
+		
+		sc.close();
+		
+	}
+
+	blah
+}

E14.java

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+/*
+ * 14. Write a Java program to print an American flag on the screen.
+Expected Output
+
+* * * * * * ==================================                          
+ * * * * *  ==================================                          
+* * * * * * ==================================                          
+ * * * * *  ==================================                          
+* * * * * * ==================================                          
+ * * * * *  ==================================                          
+* * * * * * ==================================                          
+ * * * * *  ==================================                          
+* * * * * * ==================================                          
+==============================================                          
+==============================================                          
+==============================================                          
+==============================================                          
+==============================================                          
+==============================================
+ 
+ */
+package w3resourceExcersises;
+
+public class E14 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		byte i = 0;
+		
+		while (i <= 11) {
+			if (i < 4) {
+				System.out.println("* * * * * * ==================================");
+				System.out.println(" * * * * *  ==================================");
+				i++;
+			}
+			else if (i == 4) {
+				System.out.println("* * * * * * ==================================");
+				i++;
+			}
+			else if (i < 11) {
+				System.out.println("==============================================");
+				i++;
+			};
+		}
+		
+		
+	}
+
+}

E15.java

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+/*
+ * 15. Write a program to swap two variables.
+ */
+package w3resourceExcersises;
+
+import java.util.Scanner;
+
+public class E15 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		Scanner sc = new Scanner(System.in);
+		
+		System.out.println("Insert the value of the 1st variable...");
+		int varA = sc.nextInt();
+		
+		System.out.println("Insert the value of the second variable...");
+		int varB = sc.nextInt();
+		
+		int temp = varA;
+		varA = varB;
+		varB = temp;
+		
+		System.out.println("varA: " + varA + " !   .   varB: " + varB + " !");
+		
+		sc.close();
+	}
+
+}

E16.java

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+/*
+ * 16. Write a Java program to print a face.
+Expected Output
+
+ +"""""+                                                 
+[| o o |]                                                
+ |  ^  |                                                 
+ | '-' |                                                 
+ +-----+
+
+ */
+
+
+package w3resourceExcersises;
+
+public class E16 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		System.out.println(" +\"\"\"\"\"+ ");
+		System.out.println("[| o o |]");
+		System.out.println(" |  ^  | ");
+		System.out.println(" | '-' | ");
+		System.out.println(" +-----+");
+		
+	}
+
+}