Reference no: EM13162861

hw6:1. Process can be in different states to allocate the resources better. List the symbol and meaning for each of these states.

2. What does it mean to spawn a process?

3. How can you determine what processes are owned by the current login user?

4. Compare and contrast a job number with a process identification number.

5. For this questions, refer to the following listing:

    [2]          Stopped          sort       /etc/passwd

    [3]    -     Stopped          vi    .cshrc

    [4]   +     Stopped          more    .login

    [5]           Running          find / -name  foo

 

(1) What command would you use to bring the vi editor to the foreground?

(2) What is the command you would use to kill the more?

(3) What is the command you would use to get this listing?

6. Compare and contrast background and foreground jobs. Include the syntax you use to place a command in foreground and in background

7. What is the function of jobs command?

8. How do you bring a job from foreground to background? Write down the steps

 

hw7:Q1. (Duplicate Elimination) Use a single-subscripted array to solve the following problem.

Read in 20 numbers, each of which is between 10 and 100, inclusive. As each number is read, print it only if it's not a duplicate of a number already read. Provide for the "worst case" in which all 20 numbers are different. Use the smallest possible array to solve this problem.

 

Q2. (Airline Reservations System) A small airline has just purchased a computer for its new automated reservations system. The president has asked you to program the new system. You'll write a program to assign seats on each flight of the airline's only plane (capacity: 10 seats).

Your program should display the following menu of alternatives:

 

Please type 1 for "first class"

Please type 2 for "economy"

 

If the person types 1, then your program should assign a seat in the first class section (seats 1-

5). If the person types 2, then your program should assign a seat in the economy section (seats 6-

10).Your program should then print a boarding pass indicating the person's seat number and whether it's in the first class or economy section of the plane.

 

Use a single-subscripted array to represent the seating chart of the plane. Initialize all the elements of the array to 0 to indicate that all seats are empty. As each seat is assigned, set the corresponding element of the array to 1 to indicate that the seat is no longer available.

 

Your program should, of course, never assign a seat that has already been assigned. When the first class section is full, your program should ask the person if it's acceptable to be placed in the economy section (and vice versa). If yes, then make the appropriate seat assignment. If no, then print the message "Next flight leaves in 3 hours."