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Exam 6: Loops

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Question 1

Multiple Choice

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Choose the loop that is equivalent to this loop. Int n = 1; Double x = 0; Double s; Do { S = 1.0 / (n * n) ; X = x + s; N++; } While (s > 0.01) ;

A) double x = 0;
Double s = 1;
For (int k = 1; s > 0.01; k++)
{
S = 1.0 / (k * k) ;
X = x + s;
}
B) double x = 0;
Double s = 1;
For (int k = 1; k < 100; k++)
{
S = 1.0 / (k * k) ;
X = x + s;
}
C) double x = 0;
Double s = 1;
Int k = 10;
While (s > 0.01)
{
S = 1.0 / (k * k) ;
X = x + s;
K++;
}
D) double x = 0;
Double s = 10;
Int k = 1;
While (s > 0.01)
{
S = 1.0 / (k * k) ;
X = x + s;
K++;

E) B) and D)
F) B) and C)

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Question 2

Multiple Choice

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What will be the result of running the following code fragment? Int year = 0; Double rate = 5; Double principal = 10000; Double interest = 0; While (year < 10) { Interest = (principal * year * rate) / 100; System.out.println("Interest " + interest) ; }

A) The code fragment will display the interest calculated for nine years.
B) The code fragment will continue to display the calculated interest forever because the loop will never end.
C) The code fragment will not display the calculated interest and halt abruptly.
D) The code fragment will not display any output because it will not compile.

E) C) and D)
F) A) and B)

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Question 3

Multiple Choice

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How many times does the following loop run? Int i = 0; Int j = 1; Do { System.out.println("" + i + ";" + j) ; I++; If (i % 3 == 0) { J--; } } While (j >= 1) ;

Which of the following activities can be simulated using a computer? I. Waiting time in a line at a restaurant II. Tossing a coin III. Shuffling cards for a card game

What is the output of the code snippet given below? String s = "abcdefghijkl"; Int i = 1; Do { If (i > 2) { System.out.print(s.substring (1, i) ) ; } I++; } While (i < 5) ;

Which of the following is considered a loop with a bound that could be problematic?

What is the output of the following code snippet? Int i = 1; While (i != 9) { System.out.print(i + " ") ; I++; If (i == 9) { System.out.println("End") ; } }

What will be printed by the statements below? Int a = 10; While (a > 5) { System.out.print (a + " ") ; A = a - 2; }

The process of hand-tracing code is valuable because

What is the output of the code snippet given below? String s = "12345"; Int i = 1; Do { If (i > 1) { System.out.print) ; } } While (i < 5) ;

What does the following loop compute? Scanner in = new Scanner (System.in) ; Int sum = 0; Int count = 0; While (in.hasNextInt() ) { Int value = in.nextInt() ; If (value > 0) { Sum += value; Count++; } } Double result = (sum * 1.0) /count;

What will be printed by the statements below? Int val = 1; Int sum = 0; While (val < 5) { Sum = sum + val; Val++; } System.out.print (sum) ;

Is the following code snippet legal? boolean b = false; Do { System.out.println("Do you think in Java?") ; } While (b !=B) ;

What will be the output of the following code snippet? boolean token1 = true; While (token1) { For (int i = 0; i < 10; i++) { System.out.println("Hello") ; } Token1 = false; }

What is the output of the following code snippet? Int i = 1; While (i < 10) { System.out.print(i + " ") ; I = i + 2; If (i == 5) { I = 9; } }

What is the first and last value of i to be displayed by the following code snippet? Int n = 20; For (int i = 0; i <= n; i++) { For (int j = 0; j <= i; j++) { System.out.println("" + i) ; } }

What is the output of the following code snippet? double a = 2; Int n = 16; Double r = 1; Double b = a; Int i = n; While (i > 0) { If (i % 2 == 0) // n is even { B = b * b; I = i / 2; } Else { R = r * b; I--; } } System.out.println("r = " + r) ;

Which of the following conditions can be added to the code below so it will loop until the value of sum is greater than 100? Scanner in = new Scanner (System.in) ; Int sum = 0; Do { Sum += in.nextInt() ; } While (/* put condition here */)

What is the output of the code fragment given below? Int i = 0; Int j = 0; While (i < 27) { I = i + 2; J++; } System.out.println("j=" + j) ;

What will be the range of the random numbers generated by the following code snippet? Random generator = new Random() ; Int r1 = generator.nextInt(50) + 1;