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Circle.java

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+package myprojects;
+import java.util.Scanner;
+public class Circle
+{
+	public static void main(String[] args)
+	{
+		try (Scanner s = new Scanner(System.in)) {
+			double radius = s.nextDouble();
+			double area = 0;
+			double perimeter = 0;
+			if(radius < 0)
+			{
+				System.out.println("Please enter postive number");
+			}
+			else
+			{
+				area=Math.PI*radius*radius;
+				perimeter=2*Math.PI*radius;	
+			}
+			System.out.println("Area of circle is = "+area);
+			System.out.print("Perimetere of the circle is = "+perimeter);
+		}
+
+	}
+
+}

LargestNum.java

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+package myprojects;
+import java.util.*;
+public class LargestNum
+{
+	private static final int NULL = 0;
+
+	public static void main(String[] args)
+	{
+		Scanner s = new Scanner(System.in);
+		System.out.println("Enter 3 numbers: ");
+		int x = s.nextInt();
+		int y= s.nextInt();
+		int z= s.nextInt();
+		int result=NULL;
+		if(x>y && x>z)
+		{
+			result=x;
+		}
+		else if (y>=z)
+		{
+			result = y;
+		}
+		else
+		{
+			result= z;
+		}
+		System.out.print(result);
+	}
+}