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chapter 1 self-review (redirected from chapter 1 self review)

Page history last edited by kathycabrera 13 years, 6 months ago

1.1 What is hardware? What is software?

     Hardware is the physical pieces of a computer system. Software is the programs and data.

1.2 What are the two jobs of an operating system?

     The operating system provides a user interface that allows the user to interact with the machine and manages computer resources such as CPU and main memory.

1.3 What happens to information when it is stored digitally?

     The information is is broken into pieces and the pieces are shown as numbers.

1.4 How many items can be represented with the following?

     a. 2 bits can represent 4 items.

     b. 4 bits can represent 16 items.

     c. 5 bits can represent 32 items.

     D. 7 bits can represent 128 items.

1.5 How many bits are there in each of the following?

     a. 8 bytes has 64 bits

     b. 2 KB has 16834 bits

     c. 4 MB has 335544332 bits

1.6 What are the two main hardware components in a computer? How do they work with each other?

       The two main hardware components are  Main memory and CPU. The CPU uuses the main memory to perform all the basic processing in a computer.

1.7 What is a memory address?

      Memory address is the unique number of the the memory location 

1.15 What is white space? Does it change program execution?

     White space is used in java programs to seprate the words and symbols used. It doesn't change the execution of the program.

1.16 Which of the following are not valid Java identifiers? Why?

     a. RESULT is a valid identifier.

     b. result is a valid identifier.

     c. 12345 is not a valid identifier since it starts with a number.

     d. x12345y is a valid identifier.

     e.black&white is not a valid identifier since it has a &.

     f. answer_7 is a valid identifier.

 

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