Why am I getting an exception?

Question

Please help. I get this error after the prompts from the Scanner are displayed to the console:

Exception in thread \"main\" java.util.IllegalFormatPrecisionExcep         


        

Answer 1

A: Because your format specifiers don't match input arguments used in the printf method.

Use %f rather than %d as the format specifier character for double values

System.out.printf("Diamond Cost: $%,.2f \n", diamondCost); 
                                      ^

In addition % requires an additional % to escape that character

System.out.printf("State Tax @ 10%%: $%,.2f \n", stateTax);

Finally, remove the unnecessary dot character

System.out.printf("Number Ordered: $%,.2d \n", numOrdered);
                                      ^

Read: Formatter javadoc