11 CS - End of unit 8 test (with Q's on unit 2)

Variables and constants are used for data storage in computer programs.

Discuss the similarities and differences between these data stores. [4]

A programmer is writing a program that stores data about items stored in a warehouse. Suggest suitable data types for:

Write a short pseudocode algorithm to input a password, check that it has exactly 8 characters in it, check that all the letters are upper case, and output the message "Password meets the rules" if both these conditions are true. [6]

A computer file, "Message.txt", stores a line of text.

Write an algorithm in pseudocode to display this line of text. [3]

a) Describe the purpose of each statement in this algorithm. [2]

b) Identify, using pseudocode, another loop structure that the algorithm in part a could have used. [1]

c) Write an algorithm, using pseudocode, to input a number between 0 and 100 inclusive. The algorithm should prompt for the input and output an error message if the number is outside this range. [3]

Explain why programmers find library routines useful when writing programs. Include in your answer with two examples of library routines that programmers frequently use. [4]

A system uses even parity.

Indicate whether the following bytes would fail or pass an even parity check:

a)

b)

c)

Explain the term data packet.

Data packets contain a header.

Name three components that you would expect to find in a header.

Data packets also have a payload and a trailer.

Explain these two terms.

Match the description of transmission taking place with correct term:

Indicate which statements about USB are True and which statements are False: