caladd.java

import java.util.Scanner;
  
public class caladd{
        public static void main(String args[]){
                float a,b,res;
                char choice,ch;
                Scanner scan = new Scanner(System.in);

                do {
                        System.out.print("\n1.Add two numbers\n");
                        System.out.print("2.Multiplication of two numbers\n");
			System.out.print("\n3.Subtract two numbers\n");
                        System.out.print("4.Exit\n\n");
                        System.out.print("Enter your choice : ");

                        choice = scan.next().charAt(0);
                        switch(choice){
                                case '1' : System.out.print("Enter two numbers :");
                                           a = scan.nextFloat();
                                           b = scan.nextFloat();
                                           res = a+b;
                                           System.out.print("Result = " + res);
                                           break;

				case '2' : System.out.print("Enter two numbers :");
                                           a = scan.nextFloat();
                                           b = scan.nextFloat();
      	                                   res = a-b;
                                           System.out.print("Result = " + res);
                                           break;

			   	case '3' : System.out.print("Enter two numbers :");
                                           a = scan.nextFloat();
                                           b = scan.nextFloat();
                                           res = a*b;
                                           System.out.print("Result = " + res);
                                           break;

                                case '4' : System.exit(0);
                                           break;

                                default : System.out.print("Invalid Choice \n");                                          break;
                        }
                        System.out.print("\n======================");

                } while(choice != '4');
        }
}