Question

Please give the code without any "+" operator or "println"!

Your solution must only use printf to display output. Autolab will automatically reject submissions that call print or println. Your solution must also NOT use the + operator.

OutputUtil.java contains stubs for three methods: printMoney, printTime, and main. Implement the print methods using one line of code each. In the mainmethod, call printMoney and printTime (twice each) to produce the following output:

$1.20
3.45 CHF
7:30:00
12:08:03

Neither of the print methods should display a newline character, so that they can be called in the middle of a sentence. For this exercise, the main method will print newlines after each method call.

Answer 1

public class Main {
  
public static void main(String[] args)
{
printMoney("$", 1.2, "");
System.out.printf("\n");
printMoney("", 3.45, "€");
System.out.printf("\n");
  
printTime(7, 30, 0);
System.out.printf("\n");
printTime(12, 8, 3);
System.out.printf("\n");
}
  
public static void printMoney(String prefix, double value, String suffix)
{
if(prefix.equals(""))
System.out.printf("%-,3.2f %-1s", value, suffix);
else
System.out.printf("%-1s %-,3.2f", prefix, value);
}
  
public static void printTime(int hour, int minute, int second)
{
if(hour < 0 || hour > 23 || minute < 0 || minute > 59 || second < 0 || second > 59)
{
System.out.printf("Invalid time format!\n");
return;
}
  
String sec;
if(second < 10)
sec = "0" + second;
else
sec = second + "";
  
String min;
if(minute < 10)
min = "0" + minute;
else
min = minute + "";
  
String time = hour + ":" + min + ":" + sec;
System.out.printf(time);
}
}