public class Tashenrechner {

    public static void main(String[] args) {

        int z1;
        int z2;
        z1 = IO.getInt("Zahl a");
        z2 = IO.getInt("Zahl b");
        char o;
        o = IO.getChar("Rechnenoperation (+, -, *, /, ^)");
        int out = 0;
        switch (o) {
            case '+':
                out = add(z1,z2);
                break;
            case '-':
                out = sub(z1,z2);
                break;
            case '*':
                out = mul(z1,z2);
                break;
            case '/':
                out = div(z1,z2);
                break;
            case '^':
                out = pow(z1,z2);
            default:
                System.out.println("Falscher Operator");
        }
        String erg = String.format("%d %c %d = %d",z1,o,z2,out);
        System.out.println(erg);
    }

    static int add(int a, int b) {
        return a+b;
    }

    static int sub(int a, int b) {
        return a-b;
    }

    static int mul(int a, int b) {
        return a*b;
    }

    static int div(int a, int b) {
        return a/b;
    }

    static int pow(int a, int b) {
        return (int) Math.pow(a,b);
    }
}