switch(m/10){
case 10:
case 9:
case 8:
System.out.println("評価A");
break;
case 7:
System.out.println("評価B");
break;
case 6:
System.out.println("評価C");
break;
case 5:
case 4:
System.out.println("評価D");
break;
case 3:
case 2:
case:1:
case 0:
default:
System.out.println("評価E");
break;