Computer Science Questions.

Computer Science Questions.

 

What output is generated by this for loop?

 

for (int i = 1; i <= 50; i = i * 2)

System.out.println(i);

No output is generated.

1, 2, 4, 8, 16

2, 4, 8, 16, 32

1, 2, 4, 8, 16, 32

 

 

Question 2

 

Which for loop header has symmetric bounds?

for (i = 1; i <= n; i++)

for (i = 10; i < 40; i += 5)

for (i = a; i < b; i++)

for (i = 0; i < str.length(); i++)

 

 

Question 3

 

What is the purpose of the following algorithm?

(In other words, what does this code do?)

 

 

boolean found = false;

int i = str.length() – 1;

while (!found && i > 0)

{

ch = str.charAt(i);

if (ch == ‘-‘) { found = true; }

else { i–; }

}

counting matches

comparing adjacent values

finding the last match

prompting until a match is found

 

 

Question 4

 

Which statement completes this investment loop?

 

for (years = 1;

(balance = balance + balance * rate / 100) < targetBalance;

years++)

__________

:

;

balance++;

years–;

 

 

Question 5

 

Which for loop is equivalent to the given while loop?

 

i = 1;

while (i <= 5)

{

. . .

i++;

}

for (i = 1; i < 5; i++) { … }

for (i = 1; i >= 5; i++) { … }

for (i = 1; i <= 5; i++) { … }

for (i = 1; i != 5; i++) { … }

 

Question 6

 

Consider the following pseudocode for dealing cards to players in a card game:

 

For the required number of cards

For the required number of players

Deal a card.

Which statement corresponds to the outer loop of the pseudocode?

for (int players=1; players < NUMBER_OF_PLAYERS; players++)

1.   for (int cards=1; cards <= NUMBER_OF_CARDS; cards++)
2.    for (int cards=1; cards < NUMBER_OF_CARDS; cards++)
3.   for (int players=1; players <= NUMBER_OF_PLAYERS; players++)

 

 

Question 7

 

What output does this for loop generate?

 

for (int i = 1; i <= 5; i++)

{

System.out.print(i + ” “);

}

System.out.println(i + 1);

1 2 3 4 5

The output is infinite.

None because the code does not compile.

1 2 3 4 5 6

 

 

Question 8

 

What term is used to represent a value that indicates the end of a data set?

finite

sentinel

end

fence

 

 

Question 9

 

Fill in the missing for loop header to compute pow(a, n).

 

int power = 1;

for ___________________

power = power * a;

 

 

(int f = 1; f < n; f++)

 

(int p = 1; p < n; p++)

 

(int f = n; f > 1; f–)

 

(int p = 1; p <= n; p++)

 

 

Question 10

 

Fill in the missing for loop header to compute n! (n factorial). The factorial of a number n is the product n * (n – 1) * … * 2 * 1.

 

int factorial = 1;

for ___________________

factorial = factorial * f;

(int f = 1; f < n; f++)

(int i = 1; i <= n; i++)

(int i = n; i > 0; i–)

(int f = n; f > 0; f–)

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