A technician has been asked to test an inkjet printer purchased 6 months ago that is being pulled from stock and put into use for the first time. The documentation indicates that the unit was successfully tested after it was received. After attempting to connect and install the driver, he finds that neither the self-test page nor the Windows test page produces print on the paper. He pulls the
inkjet cartridge out and shakes it, determining that it has ink in it. What should he do next?
a. Replace the cartridge with a new one.
b. Send the printer back to the manufacturer.
c. Call the manufacturer.
d. Reinstall the correct driver.
A. Most likely the print cartridge nozzle is stopped up with dried ink from being on the shelf for so long after the initial testing. Replacing the cartridge will verify if that is the case and is generally the simplest of the options listed to attempt. Note that some inkjet printers have a nozzle cleaning utility, which would be worth trying in a case like this.
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Use two iterations of Newton's method with an initial guess of 5.0000 to approximate a root of this equation. Show all your work.
``` -4x 3 - 40x 2 + 81x + 810 = 0 ``` What will be an ideal response?
Write an application that encrypts a message from the user (Fig. 23.18). The application should be able to encrypt the message in two different ways: substitution cipher and transposition cipher (both described below). The user should be able to enter the message in a JTextField and select the desired method of encryption. The encrypted message is then displayed in an uneditable JTextField. In a substitution cipher, every character in the English alphabet is represented by a dif- ferent character in a substitution String, which we will refer to as the substitution alphabet. Every time a letter occurs in the English sentence, it is replaced by the letter in the corre- sponding index of the substitution String. As an example of a substitution cipher, let’s e
a) Copying the template to your working directory. Copy the C:Examples Tutorial23ExercisesCipherEncryption directory to your C:SimplyJava directory.
b) Opening the template file. Open the Encryption.java file in your text editor.
c) Adding code to the substitutionCipher method. In the substitutionCipher method (lines 126–140), English and substitution alphabet Strings have been declared for you as normalAlphabet and cipherAlphabet, respectively. Other Strings that you will be using have already been defined for you—cipher is an empty String you will use to store the encrypted text and plain contains the text entered by the user. After the declaration of the Strings, add an empty for state- ment that loops for each character in plain.
d) Performing the substitution encryption. Inside the for statement you added in Step c, create an int variable index and assign to it the index in normalAlphabet where the current character in plain