public static int calculate(String input){
    int lhs,rhs; //short for left-hand & right-hand side
    char operation;
    Scanner scanner = new Scanner(input);
    lhs = scanner.nextInt();
    while(scanner.hasNext()) {
                operation = scanner.next().charAt(0);
                rhs = scanner.nextInt();
                        switch(operation) {
                        case '+':
                                lhs += rhs;
                                break;
                        case '-':
                                lhs -= rhs;
                                break;
                        case '*':
                                lhs *= rhs;
                                break;
                        case '/':
                                lhs /= rhs;
                                break;
                        default:
                                //error!! wrong operation, do something
                                break;
                        }
                System.out.println(lhs);

        }





/*todo: your name and code goes here*/
/*You need a Scanner(or StringTokenizer) to get tokens
*Then you need a loop, and switch inside that loop*/
return lhs;
}