[marke123]

import java.util.*;
class calc12345
{
public static void main()
{
int a,b,c;


String a1;
Scanner sc=new Scanner(System.in);
System.out.println("Enter first number");
a=sc.nextInt();
System.out.println("Enter second number");
b=sc.nextInt();
System.out.println("Enter the operator");
a1=sc.next();
if(a1=="+")
System.out.println(a+b);
else if(a1=="-")
System.out.println(a-b);
else if(a1=="/")
System.out.println(a/b);
else if(a1=="*")
System.out.println(a*b);
else if(a1=="%")
System.out.println(a%b);
else
System.out.println("Invalid Operator");
}
}
I have entered the operator "+" & it is saying invalid operator