NPTEL Programming in Java Week 5 Programming Assignment 1 Answer

An interface Number is defined in the following program.  You have to declare a class A, which will implement the interface Number. Note that the method findSqr(n) will return the square of the number n.

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File name for this program : 

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import java.util.Scanner;

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​

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interface Number {

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    int findSqr(int i);  // Returns the square of n

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}

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//Create a class A which implements the interface Number.

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class A implements Number

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   {

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     public int findSqr(int i) {

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     return i*i;

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      }

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  }

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public class Question5_1{ 

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        public static void main (String[] args){ 

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          A a = new A();   //Create an object of class A

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           // Read a number from the keyboard

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           Scanner sc = new Scanner(System.in);  

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           int i = sc.nextInt();

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           System.out.print(a.findSqr(i)); 

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    } 

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}