Create 42.1 Binary Operation Using Lambda Operation.java

Author: prokrishpatel

42.1 Binary Operation Using Lambda Operation.java

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+/*
+
+
+Ram's teacher is giving the task to Ram to do the basic arithmetic opertions on two integer values.At a time he can do only one operation. Help the Ram to do the same using Lambda expression.
+
+Input Format
+
+First line will contain two ineteger values on which we have to perform the operation
+Second line will contain one integer value which will describe the operation
+1 addition
+2 subtraction
+3 multiplication
+4 division
+
+Constraints
+
+number should be integer value
+
+Output Format
+
+one integer value represnting result of the operation if wrong input then print Invalid
+
+Sample Input 0
+
+4 5
+2
+Sample Output 0
+
+-1
+Sample Input 1
+
+3 7.9
+1
+Sample Output 1
+
+Invalid
+*/
+import java.util.Scanner;
+import java.util.function.BinaryOperator;
+
+public class Main {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int a=0,b=0,op=5;
+        try
+        {
+         a = sc.nextInt();
+         b = sc.nextInt();
+         op = sc.nextInt();
+        }
+        catch(Exception e)
+        {
+            System.out.print("Invalid");
+            System.exit(0);
+        }
+        BinaryOperator<Integer> operation;
+
+        switch (op) {
+            case 1:
+                operation = (x, y) -> x + y;
+                break;
+            case 2:
+                operation = (x, y) -> x - y;
+                break;
+            case 3:
+                operation = (x, y) -> x * y;
+                break;
+            case 4:
+                operation = (x, y) -> x / y;
+                break;
+            default:
+                System.out.println("Invalid");
+                return;
+        }
+
+        int result = operation.apply(a, b);
+        System.out.println(result);
+    }
+}