## Chapter 4

## Q. 4.1

Determine the UPC label structure for the digit 0.

## Step-by-Step

## Verified Solution

From Figure 3a, the binary sequence for the digit 0 in the left-hand character field is 0001101, and the binary sequence for the digit 0 in the right-hand character field is 1110010.

The left-hand sequence is comprised of three successive 0s, followed by two 1s, one 0, and one 1. The three successive 0s are equivalent to a space three bits long. The two 1s are equivalent to a bar two bits long. The single 0 and single 1 are equivalent to a space and a bar, each one bit long.

The right-hand sequence is comprised of three 1s followed by two 0s, a 1, and a 0. The three 1s are equivalent to a bar three bits long. The two 0s are equivalent to a space two bits long. The single 1 and single 0 are equivalent to a bar and a space, each one bit long each. The UPC pattern for the digit 0 is shown in Figure 4.