int codigo , quant;

double total[] = {0 , 1 , 2 , 3 , 4};

Scanner sc = new Scanner(System.in);

codigo = sc.nextInt() ;

quant = sc.nextInt() ;

switch (codigo) {

case 1 :

total [0] = quant * 4 ;

System.out.printf("Total: R$ " + "%.2f %n" , total [0] );

break;

case 2 :

total [1] = quant * 4.5 ;

System.out.printf("Total: R$ " + "%.2f %n" , total [1] );

break;

case 3 :

total [2] = quant * 5 ;

System.out.printf("Total: R$ " + "%.2f %n" , total [2] );

break;

case 4 :

total [3] = quant * 2 ;

System.out.printf("Total: R$ " + "%.2f %n" , total [3] );

break;

case 5 :

total [4] = quant * 1.5 ;

System.out.printf("Total: R$ " + "%.2f %n" , total [4] );

break;

}