operazioni

import java.util.*;
public class Prova_metosd {
    static int somma(int a, int b){
        int s=a+b;
        return s;
    }
    static int differenza(int a, int b){
        int s=a-b;
        return s;
    }
    static int moltiplicazione(int a, int b){
        int s=a*b;
        return s;
    }
    static float div(int a, int b){
        float s=a/b;
        return s;
    }


    public static void main(String[] args) {
        Scanner input = new Scanner (System.in);
        String continua="si";
        do{
            System.out.println("scegli operazione \n 1 somma \n 2 differenza \n 3 moltiplicazione \n 4 divisione");
            int a=input.nextInt();
            switch(a){
            case 1: System.out.println("inserisci valori");
            int b= input.nextInt();
            int c= input.nextInt();
            System.out.println(somma(b,c));; break;

            case 2: System.out.println("inserisci valori");
            int b1= input.nextInt();
            int c1= input.nextInt();
            System.out.println(differenza(b1,c1)); break;

            case 3: System.out.println("inserisci valori");
            int b2= input.nextInt();
            int c2= input.nextInt();
            System.out.println(moltiplicazione(b2,c2));; break;

            case 4: System.out.println("inserisci valori");
            int b3= input.nextInt();
            int c3= input.nextInt();
            System.out.println(div(b3,c3));; break;

            default: System.out.println("opzione non valida");
            }
            System.out.println("riprovare?");
            continua=input.next();
        }while(continua.equals("si"));
        System.out.println("ciao.");
        input.close();
    }

}