Code d'une calculatrice en java

verifie ce programme.

public class calc{
public static void main(String[] args){
int x=Integer.parseInt(args[0]);
char oper=args[1].charAt(0);
int y=Integer.parseInt(args[2]);
if(oper=='+'){
int z=x+y;
System.out.println("La somme de "+x+" et "+y+" est:" +z );
}
else
if(oper=='-'){
int z=x-y;
System.out.println("La soustraction de "+x+" et "+y+" est:" +z );
}
else
if(oper=='x'){
int z=x*y;
System.out.println("La multiplication de "+x+" et "+y+" est:" +z );
}
else
if(oper=='/'){
int z=x/y;
System.out.println("La division de "+x+" et "+y+" est:" +z );
}
}
}