Chapter 5, Problem 22PP

Postal bar codes. For faster sorting of letters, the United States Postal Service encourages companies that send large volumes of mail to use a bar code denoting the zip code (see Figure 7).

The encoding scheme for a five-digit zip code is shown in Figure 8. There are full-height frame bars on each side. The five encoded digits are followed by a check digit, which is computed as follows: Add up all digits, and choose the check digit to make the sum a multiple of 10. For example, the zip code 95014 has a sum of 19, so the check digit is 1 to make the sum equal to 20.

Figure 7 A Postal Bar Code

Figure 8 Encoding for Five-Digit Bar Codes

Each digit of the zip code, and the check digit, is encoded according to the table below, where 1 denotes a full bar and 0 a half bar:

The digit can be easily computed from the bar code using the column weights 7, 4, 2, 1, 0. For example, 01100 is 0 × 7 + 1 × 4 + 1 × 2 + 0 × 1 + 0 × 0 = 6. The only exception is 0, which would yield 11 according to the weight formula.

Write a program that asks the user for a zip code and prints the bar code. Use : for half bars, | for full bars. For example, 95014 becomes

Provide these methods:

 public static void printDigit(int d)

 public static void printBarCode(int zipCode)