Question 1

Assume the following variable has been declared and given a value as shown: Random rand = new Random();
Int number = rand.nextInt (27) * 2 + 3;
What are the smallest and largest values number may be assigned?

Accepted Answer

The smallest value number may be assigned is 3, which occurs when rand.nextInt(27) returns 0. The largest value number may be assigned is 55, which occurs when rand.nextInt(27) returns 26.

Question 2

How many times is the text "Let's have fun with Java." printed when this code snippet is run?
Int i = 0;
Do
{
System.out.println("Let's have fun with Java.");
I++;
If (i % 2 == 0)
{
I = 10;
}
}
While (i <= 10);

Accepted Answer

The loop runs three times: i starts at 0, increments to 1, then to 2, and when i is 2, it is set to 10, causing the loop to terminate after the third print.

Question 3

Given the following code snippet, what should we change to have 26 alphabet characters in the string str? String str = "";
For (char c = 'A'; c < 'Z'; c++)
{
Str = str + c;
}

Accepted Answer

The loop condition should be changed to `c <= 'Z'` to include the character 'Z' in the string.

Question 4

What is the output of the following loop?
Int s = 1;
Int n = 1;
Do
{
S = s + n;
N++;
}
While (s < 10 * n);
System.out.println(s);

Accepted Answer

The loop will continue until s is less than 10 * n. In the first iteration, s = 1 and n = 1, so s = 1 + 1 = 2 and n = 2. In the second iteration, s = 2 and n = 2, so s = 2 + 2 = 4 and n = 3. In the third iteration, s = 4 and n = 3, so s = 4 + 3 = 7 and n = 4. In the fourth iteration, s = 7 and n = 4, so s = 7 + 4 = 11 and n = 5. The loop will stop because s is no longer less than 10 * n. The final value of s is 11, so the output is 11.

Question 5

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);

Accepted Answer

The loop in option A is equivalent to the given loop because it has the same initialization, condition, and increment statements.

Question 6

Which of the following loop(s) could possibly not enter the loop body at all?
I. for loop
II. while loop
III. do loop

Accepted Answer

A 'for loop' and a 'while loop' can both potentially not execute their loop body if the initial condition is false. A 'do loop' (do-while loop) will always execute its loop body at least once because the condition is checked after the loop body is executed.

Question 7

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

Accepted Answer

The answer of Is the following code snippet legal? boolean...

Question 8

Which of the loop(s) test the condition after the loop body executes?
I. for loop
II. while loop
III. do loop

Accepted Answer

The answer of Which of the loop(s) test the condition...

Question 9

Assume the following variable has been declared and given a value as shown: Random rand = new Random();
Which of the following will generate a random integer in the range - 20 to 20, inclusive, where each value has an equal chance of being generated?

Accepted Answer

The method `rand.nextInt(41)` generates a random integer from 0 to 40. Subtracting 20 shifts the range to -20 to 20, inclusive.

Question 10

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);

Accepted Answer

The loop will run infinitely because the condition i < 5 is always true.

Question 11

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);

Accepted Answer

The loop runs 3 times. The first time, i is 0 and j is 1. The second time, i is 1 and j is 0. The third time, i is 2 and j is -1. The loop terminates because j is less than 1.

Question 12

Assume the following variable has been declared and given a value as shown: Random rand = new Random();
Double number = rand.nextDouble () * 2 + 3;
What are the smallest and largest values number may be assigned?

Accepted Answer

The nextDouble() method generates a value between 0.0 (inclusive) and 1.0 (exclusive). Multiplying by 2 gives a range of 0.0 to 2.0, and adding 3 shifts the range to 3.0 to 5.0.

Question 13

What for loop can be used in the indicated area so the code will print: ****
***
**
*
For (int val = 0; val < 4; val ++)
{
System.out.print ("+");
// Put for loop here
{
System.out.print ("*");
}
System.out.println ();
}

Accepted Answer

The loop should run fewer times as 'val' increases, so the correct loop is for (int num = 0; num < 4 - val; num++).

Question 14

How many times does the following loop run?
Int i = 0;
Int j = 1;
Do
{
System.out.println("" + i + ";" + j);
I++;
If (i % 2 == 0)
{
J--;
}
}
While (j >= 1);

Accepted Answer

The loop runs twice. The first time, i is 0 and j is 1. The second time, i is 1 and j is 0. The loop terminates because j is less than 1.

Question 15

What is the output of the code below? for (int val = 0; val < 4; val ++)
{
Int sum = val;
For (int num = 0; num < val; num++)
{
Sum = sum + num;
}
System.out.print (sum + " ");
}

Accepted Answer

The answer of What is the output of the code...

Question 16

Which loop does not check a condition at the beginning of the loop?
I. The do loop
II. The while loop
III. The for loop

Accepted Answer

The do loop does not check a condition at the beginning of the loop. It executes the loop body at least once, and then checks the condition at the end of the loop.

Question 17

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

Accepted Answer

The code has a syntax error due to the incorrect use of "System.out.print);" which will cause a compilation error, leading to no output. If corrected, the loop would run infinitely without incrementing 'i'.

Question 18

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);

Accepted Answer

The loop starts with i=1 and increments i until i<5. The substring is printed only when i>2, resulting in "bc" for i=3 and "bcd" for i=4, concatenated as "bcbcd".

Question 19

What is the result when the following code is run? double x = 1;
Double y = 1;
Int i = 0;
Do
{
Y = x / 2;
X = x + y;
I = i + 1;
}
While (x < 2.5);
System.out.print(i + " ");

Accepted Answer

The loop runs three times: x becomes 1.5, then 2.25, and finally 3.125, at which point the condition x < 2.5 is false.

Question 20

Which of the following loops executes the statements inside the loop before checking the condition?

Accepted Answer

The do-while loop executes the statements inside the loop before checking the condition. It ensures that the loop executes at least once even if the condition is false from the beginning.

Quiz 6: Loops

Assume the following variable has been declared and given a value as shown: Random rand = new Random() ; Int number = rand.nextInt (27) * 2 + 3; What are the smallest and largest values number may be assigned?

How many times is the text "Let's have fun with Java." printed when this code snippet is run? Int i = 0; Do { System.out.println("Let's have fun with Java.") ; I++; If (i % 2 == 0) { I = 10; } } While (i <= 10) ;

Given the following code snippet, what should we change to have 26 alphabet characters in the string str? String str = ""; For (char c = 'A'; c < 'Z'; c++) { Str = str + c; }

What is the output of the following loop? Int s = 1; Int n = 1; Do { S = s + n; N++; } While (s < 10 * n) ; System.out.println(s) ;

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) ;

Which of the following loop(s) could possibly not enter the loop body at all? I. for loop II. while loop III. do loop

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

Which of the loop(s) test the condition after the loop body executes? I. for loop II. while loop III. do loop

Assume the following variable has been declared and given a value as shown: Random rand = new Random() ; Which of the following will generate a random integer in the range - 20 to 20, inclusive, where each value has an equal chance of being generated?

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) ;

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) ;

Assume the following variable has been declared and given a value as shown: Random rand = new Random() ; Double number = rand.nextDouble () * 2 + 3; What are the smallest and largest values number may be assigned?

What for loop can be used in the indicated area so the code will print: ** * ** * For (int val = 0; val < 4; val ++) { System.out.print ("+") ; // Put for loop here { System.out.print ("*") ; } System.out.println () ; }

How many times does the following loop run? Int i = 0; Int j = 1; Do { System.out.println("" + i + ";" + j) ; I++; If (i % 2 == 0) { J--; } } While (j >= 1) ;

What is the output of the code below? for (int val = 0; val < 4; val ++) { Int sum = val; For (int num = 0; num < val; num++) { Sum = sum + num; } System.out.print (sum + " ") ; }

Which loop does not check a condition at the beginning of the loop? I. The do loop II. The while loop III. The for loop

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

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) ;

What is the result when the following code is run? double x = 1; Double y = 1; Int i = 0; Do { Y = x / 2; X = x + y; I = i + 1; } While (x < 2.5) ; System.out.print(i + " ") ;

Which of the following loops executes the statements inside the loop before checking the condition?

Quiz 6: Loops

Assume the following variable has been declared and given a value as shown: Random rand = new Random() ; Int number = rand.nextInt (27) * 2 + 3; What are the smallest and largest values number may be assigned?

How many times is the text "Let's have fun with Java." printed when this code snippet is run? Int i = 0; Do { System.out.println("Let's have fun with Java.") ; I++; If (i % 2 == 0) { I = 10; } } While (i <= 10) ;

Given the following code snippet, what should we change to have 26 alphabet characters in the string str? String str = ""; For (char c = 'A'; c < 'Z'; c++) { Str = str + c; }

What is the output of the following loop? Int s = 1; Int n = 1; Do { S = s + n; N++; } While (s < 10 * n) ; System.out.println(s) ;

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) ;

Which of the following loop(s) could possibly not enter the loop body at all? I. for loop II. while loop III. do loop

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

Which of the loop(s) test the condition after the loop body executes? I. for loop II. while loop III. do loop

Assume the following variable has been declared and given a value as shown: Random rand = new Random() ; Which of the following will generate a random integer in the range - 20 to 20, inclusive, where each value has an equal chance of being generated?

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) ;

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) ;

Assume the following variable has been declared and given a value as shown: Random rand = new Random() ; Double number = rand.nextDouble () * 2 + 3; What are the smallest and largest values number may be assigned?

What for loop can be used in the indicated area so the code will print: **** *** ** * For (int val = 0; val < 4; val ++) { System.out.print ("+") ; // Put for loop here { System.out.print ("*") ; } System.out.println () ; }

How many times does the following loop run? Int i = 0; Int j = 1; Do { System.out.println("" + i + ";" + j) ; I++; If (i % 2 == 0) { J--; } } While (j >= 1) ;

What is the output of the code below? for (int val = 0; val < 4; val ++) { Int sum = val; For (int num = 0; num < val; num++) { Sum = sum + num; } System.out.print (sum + " ") ; }

Which loop does not check a condition at the beginning of the loop? I. The do loop II. The while loop III. The for loop

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

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) ;

What is the result when the following code is run? double x = 1; Double y = 1; Int i = 0; Do { Y = x / 2; X = x + y; I = i + 1; } While (x < 2.5) ; System.out.print(i + " ") ;

Which of the following loops executes the statements inside the loop before checking the condition?

What for loop can be used in the indicated area so the code will print: ** * ** * For (int val = 0; val < 4; val ++) { System.out.print ("+") ; // Put for loop here { System.out.print ("*") ; } System.out.println () ; }