discussion on programming

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$$Packages & Interfaces in java package my_package; import java.util.Scanner; interface perimeter1 { void calculate(); } class circle1 implements perimeter1 { private double r; public void calculate() { System.out.println("Enter radius:"); Scanner input=new Scanner(System.in); double r=input.nextDouble(); double p=2*3.14*r; System.out.println("perimeter of circle is:- "+p); } } class rectangle1 implements perimeter1 { private double length,breadth; public void calculate() { System.out.println("Eneter length"); Scanner input=new Scanner(System.in); double length=input.nextDouble(); System.out.println("Eneter breadth"); double breadth=input.nextDouble(); double p=2*(length+breadth); System.out.println("perimeter of rectangle is:- "+p); } } class main1 { public static void main(string args[]) { perimeter1 obj; circle1 obj1=new circle1(); rectangle1 ob...

/*          Name: Magic Square.           Author: Ketan Kulkarni           Date: 17-10-19 00:11           SPPU assignment no.3           Description: Write a c++ program to implement the magic square. */ #include <iostream> using namespace std; int main() {           int i,j,l,k,size=3,row,col,m,nr,nc;           int matrix[3][3];           for(i=0;i<3;i++)           {                     for(j=0;j<3;j++)          ...