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Sergio [31]
2 years ago
10

In what year was the first permanent photographic image created?

Computers and Technology
1 answer:
kvv77 [185]2 years ago
5 0

Answer:

1826

Explanation:

it was in 1826 when the first permanent photographic image was created.

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Help with some questions. Thank you!
Oksana_A [137]

Answer:

1. E: II and III only

2. A: (int)(Math.random() * (upper − lower) ) + lower

3. A: The value of answer is N

4. E: while( !(userGuess == secretNumber) && numGuesses <= 15 )

5. C: 21

Explanation:

1. Which of the following is equivalent to while(userGuess != secretNumber)?

I. while( userGuess < secretNumber && userGuess > secretNumber)  

NO - This will test until the userGuess is smaller AND greater than the secretNumber, at the same time... so that condition will never be true.

II. while( userGuess < secretNumber || userGuess > secretNumber)

YES - This will test the value of userGuess and see if it's smaller OR greater than secetNumber.  So, it will loop until the user guesses right.

III. while( !(userGuess == secretNumber) )

YES, this will negate the match with the secretNumber.  In order words, if it's not a match, it will return true... so the loop will run until it finds a false condition (a match).

As you can see, only II and III are valid.

2.  If the lower limit were inclusive and the upper limit exclusive, which expression would properly generate values for the secret number?

A: (int)(Math.random() * (upper − lower) ) + lower

Since the lower limit is INCLUSIVE, we mustn't add one to the lower limit.  Also, the Math.random() function returns a value that matches our needs; it returns a value between [0,1[ (meaning the 0 is included, but not the 1).

Assuming the (int) caster does return only the integer portion doing a round down of the result, we'll be perfect.

3. What conclusion can be made about the state of the program when the while loop terminates?

while(!answer.equals( "N"))

{.....

A: The value of answer is N

The condition in the loops reads as "While the negation of the answer being 'N', loop".  If the answer equals 'N' then the method should return true... which will be negated by the '!' operator, causing the condition to be false. Thus we know that if the loop ends, the value of answer contains 'N', any other value will keep the loop going.

4. Assuming numGuesses is initialized to 1, how would the while statement be modified to include an extra criterion limiting the number of guesses to 15?

E: while( !(userGuess == secretNumber) && numGuesses <= 15 )

This modified condition will first test to see if the user has guessed the secretNumber (if he has, the first sub-parenthesis will be true... so the left side of the && operator will be false due to the negation operator.  The right side of the && operator will check to see how many tries have been attempted. Since the counter starts at 1, it needs to go up to 15 inclusively... so the <= is the right comparison operator.

5. After execution of the following code segment, what will be displayed?

int x = 1;

while(x < 18)

{

x += 5;

}

System.out.println(x);

C: 21

The x variable is initialized with 1... then enters the loop, in which it is incremented by 5 at each passage.

So after first passage, x = 6

After second passage, x = 11

After third passage, x = 16

After fourth passage, x = 21

Cannot enter the loop again because 21 > 18.

So, it will print out the value of 21.

3 0
3 years ago
Suppose you are currently in the /home/hnewman/os/fall/2013 directory and would like to navigate to /home/hnewman/discreteStruct
Alex Ar [27]

Answer:

C

Explanation:

ive been doing this same one so its C

6 0
3 years ago
The IT department sent out a memo stating that it will start delivering desktop computer interfaces through the IT data center v
Tasya [4]

Answer: Virtual desktop infrastructure

Explanation:

The virtual desktop infrastructure is the virtualization technology in which the host desktop OS (operating system)  is in the centralized server of the data center. The virtual desktop infrastructure is also known as server based computing as it include the variation in the computing model such as client - server model.

The example of the virtual desktop infrastructure is wallpapers, toolbars, window and folder is the stored in the server remotely.

All the other options does not involve with this technology so that is why option (D) is correct.

4 0
3 years ago
When using for loops and two-dimensional arrays, the outside loop moves across the ___________ and the inside loop moves across
lana66690 [7]

Answer: rows, columns

Explanation: :)

6 0
3 years ago
What is printed when the following code has been executed?
serg [7]
Hey it is 15 hope this helps
3 0
3 years ago
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