Question 1

Which of the following operators is used as a relational operator?
A) =<
B) <=
C) =
D) !

Accepted Answer

The <= operator means "less than or equal to" and is used to compare two values to see if one is less than or equal to the other. This makes it a relational operator. The other options are either assignment operators (such as =) or a logical operator (such as !).

Question 2

What is the output of the following code snippet?
Double income = 45000;
Double cutoff = 55000;
Double minIncome = 30000;
If (minIncome > income)
{
System.out.println("Minimum income requirement is not met.");
}
If (cutoff < income)
{
System.out.println("Maximum income limit is exceeded.");
}
Else
{
System.out.println("Income requirement is met.");
}
A) Minimum income requirement is not met.
B) Maximum income limit is exceeded.
C) Income requirement is met.
D) There is no output.

Accepted Answer

The income is 45000, which is greater than the minimum income of 30000 and less than the cutoff of 55000, so the "Income requirement is met." message is printed.

Question 3

Which of the following statements is (are) true about an if statement?
I. It guarantees that several statements are always executed in a specified order.
II. It repeats a set of statements as long as the condition is true.
III. It allows the program to carry out different actions depending on the value of a condition.
A) I
B) II
C) III
D) I, II, III

Accepted Answer

An if statement allows the program to carry out different actions depending on the value of a condition. It does not guarantee a specific order of execution, nor does it repeat a set of statements as long as the condition is true. Therefore, statements II and I are false, making only statement III true. Therefore, the correct answer is C.

Question 4

Which of the following statements is correct about an if statement?
A) You must use braces if the body of an if statement contains only a single statement.
B) You can omit an else statement if there is no task defined in the else branch.
C) You cannot use braces if the body of an if statement contains only a single statement.
D) The number of opening braces can be different from the number of closing braces.

Accepted Answer

It is true that you can omit an else statement if there is no task defined in the else branch. However, A and C are incorrect because you can always use braces if you prefer, and the number of opening and closing braces must be the same in a valid if statement. Option D is also incorrect because it is not possible to have a valid if statement with an unequal number of opening and closing braces.

Question 5

Which of the following is the correct syntax for an if statement?
A) if (x < 10) { size = "Small"; }
Else (x < 20) { size = "Medium"; }
B) if (x < 10); { size = "Small"; }
Else (x < 20) { size = "Medium"; }
C) if (x < 10) { size = "Small"; }
Else { size = "Medium"; }
D) if { size = "Small"; }
Else (x < 20) { size = "Medium"; }

Accepted Answer

Option C is the correct syntax for an if statement. It follows the pattern of "if (condition) { statement } else { statement }" where the condition is checked and appropriate actions are taken based on whether the condition is true or false. Option A has an incorrect syntax for the else statement and option B has an unnecessary semicolon after the if condition. Option D has no condition to check for and has incorrect syntax for the else statement.

Question 6

What are the two parts of an if statement?
A) A condition and a body
B) A check and an increment
C) An increment and a body
D) An increment and a return value

Accepted Answer

An if statement consists of a condition that evaluates to true or false and a body of code that only executes if the condition is true. Therefore, choice A is the correct answer as it describes the two essential parts of an if statement.

Question 7

The operator !> stands for
A) not less than.
B) not greater than.
C) not equal to.
D) this is not an operator in Java

Accepted Answer

The operator !> is not a recognized operator in Java. Java supports operators like <, >, <=, >=, !=, but !> is not among them.

Question 8

Which of the following statements is true about the if statement?
A) The if statement can have only one condition that evaluates to an integer value.
B) The if block is optional.
C) The else block is optional.
D) The if and else blocks should always be included within curly braces.

Accepted Answer

The else block is optional in an if statement, but the if block is required. The if statement can have any number of conditions as long as they evaluate to a boolean value. It is recommended to always include the if and else blocks within curly braces for clarity and readability, but it is not required.

Question 9

Assuming that a user enters 15 as input, what is the output of the following code snippet?
Scanner in = new Scanner(System.in);
System.out.print("Please enter a number: ");
Int number = in.nextInt();
If (number > 20)
{
System.out.println("The number is LARGE!");
}
Else
{
System.out.println("The number is SMALL!");
}
A) There is no output due to compilation errors.
B) The number is LARGE!
C) The number is SMALL!
D) The number is LARGE!
The number is SMALL!

Accepted Answer

The user enters 15 as input, which is less than 20. Therefore, the if condition is not satisfied and the output will be "The number is SMALL!"

Question 10

A store provides 10 percent discount on all items with a price of at least $100. No discount is otherwise applicable. Which of the following DOES NOT correctly compute the discount? A) double discount = 0; If (price >= 100) { Discount = 0.10 * price; } B) double discount = 0.10 * price; If (price <= 100) { Discount = 0; } C) double discount; If (price < 100) { Discount = 0; } Else { Discount = 0.10 * price; } D) double discount = 10; If (price >= 100) { Discount = 0.1 * price; } Else { Discount = 0; }

Accepted Answer

The answer of A store provides 10 percent discount on...

Question 11

Which statement about an if statement is true?
A) The condition in an if statement using relational operators will evaluate to a Boolean result
B) The condition in an if statement should make exact comparisons to floating-point numbers
C) The condition in an if statement should always evaluate to true
D) The condition in an if statement should never include integer variables

Accepted Answer

The condition in an if statement using relational operators will evaluate to a Boolean result. This is true because relational operators compare two values and return a Boolean result (true or false) depending on their relationship.

Question 12

Assuming that the user provides 303 as input, what is the output of the following code snippet?
Int x;
Int y;
X = 0;
Scanner in = new Scanner(System.in);
System.out.print("Please enter a number: ");
Y = in.nextInt();
If (y > 300)
{
X = y;
}
Else
{
X = 0;
}
System.out.println("x: " + x);
A) x: 0
B) x: 300
C) x: 303
D) There is no output due to compilation errors.

Accepted Answer

The input 303 is greater than 300, so the condition in the if statement is true, and x is set to 303.

Question 13

Suppose one needs an if statement to check whether an integer variable pitch is equal to 440 (which is the frequency of the note "A" to which strings and orchestras tune). Which condition is correct?
A) if (pitch - 440 = 0)
B) if ((pitch !< 440) && (pitch !> 440))
C) if (pitch = 440)
D) if (pitch == 440)

Accepted Answer

Option A uses the assignment operator "=" instead of the comparison operator "==" so it is not correct. Option B uses the logical NOT operator "!<" and "!>" which means "not less than" and "not greater than", respectively. This is not the correct way to express "equal to", so it is not correct. Option C uses the assignment operator "=" instead of the comparison operator "==" so it is not correct. Option D correctly uses the comparison operator "==" to check if pitch is equal to 440, so it is the correct answer.

Question 14

What kind of operator is the <= operator?
A) Ternary
B) Arithmetic
C) Inequality
D) Relational

Accepted Answer

The <= operator is a relational operator used to compare two values and check if the left operand is less than or equal to the right operand. It returns a Boolean value of true or false. Therefore, the best choice is D (Relational).

Question 15

Assuming that a user enters 25 as the value for x, what is the output of the following code snippet?
Int x = 0;
Scanner in = new Scanner(System.in);
System.out.print("Enter a number: ");
X = in.nextInt();
If (x < 100)
{
X = x + 5;
}
If (x < 500)
{
X = x - 2;
}
If (x > 10)
{
X++;
}
Else
{
X--;
}
System.out.println(x);
A) 27
B) 28
C) 29
D) 30

Accepted Answer

The user enters 25, so x becomes 25. The first if condition adds 5, making x = 30. The second if condition subtracts 2, making x = 28. The third if condition increments x by 1, making x = 29. The else block is not executed because the third if condition is true.

Question 16

What is the output of the following code snippet if the input is 25?
Int i = 0;
Scanner in = new Scanner(System.in);
System.out.print("Enter a number: ");
I = in.nextInt();
If (i > 25)
{
I++;
}
Else
{
I--;
}
System.out.print(i);
A) 24
B) 25
C) 26
D) 27

Accepted Answer

The input is 25, so the condition `i > 25` is false. The else block executes, decrementing `i` by 1, resulting in 24.

Question 17

In Java, which of the following orderings is used to compare strings?
A) Lexicographic
B) Semantic
C) Alphabetic
D) Syntactic

Accepted Answer

Java uses lexicographic ordering to compare strings, which means it orders them based on their dictionary order, comparing the characters one-by-one from left to right.

Question 18

The following code snippet contains an error. What is the error?
If (cost > 100);
{
Cost = cost - 10;
}
System.out.println("Discount cost: " + cost);
A) Syntax error (won't compile)
B) Logical error: use of an uninitialized variable
C) Logical error: if statement has do-nothing statement after if condition
D) Logical error: assignment statement does not show equality

Accepted Answer

The answer of The following code snippet contains an error....

Question 19

What can be done to improve the following code fragment?
If ((counter % 10) == 0)
{
System.out.println("Counter is divisible by ten: " + counter);
Counter++;
}
Else
{
System.out.println("Counter is not divisible by ten: "
+ counter);
Counter++;
}
A) Move the duplicated code outside of the if statement
B) Shorten variable names
C) Move the brackets to save several lines of code
D) Add semicolons after the if condition and the else reserved word

Accepted Answer

The code that increases the counter variable is duplicated in both the if and else blocks. Moving this code outside of the if statement and having it run after both branches will improve the code by eliminating the repetition of code.

Question 20

Assuming that the user provides 99 as input, what is the output of the following code snippet?
Int a;
Int b;
a = 0;
Scanner in = new Scanner(System.in);
System.out.print("Please enter a number: ");
b = in.nextInt();
If (b > 300)
{
a = b;
}
else
{
a = 0;
}
System.out.println("a: " + a);
A) a: 0
B) a: 99
C) a: 100
D) a: 300

Accepted Answer

The answer of Assuming that the user provides 99 as...

Quiz 3: Decisionseasy

Which of the following operators is used as a relational operator?

Which of the following statements is correct about an if statement?

Which of the following is the correct syntax for an if statement?

What are the two parts of an if statement?

The operator !> stands for

Which of the following statements is true about the if statement?

A store provides 10 percent discount on all items with a price of at least $100. No discount is otherwise applicable. Which of the following DOES NOT correctly compute the discount?

Which statement about an if statement is true?

Assuming that the user provides 303 as input, what is the output of the following code snippet? Int x; Int y; X = 0; Scanner in = new Scanner(System.in) ; System.out.print("Please enter a number: ") ; Y = in.nextInt() ; If (y > 300) { X = y; } Else { X = 0; } System.out.println("x: " + x) ;

Suppose one needs an if statement to check whether an integer variable pitch is equal to 440 (which is the frequency of the note "A" to which strings and orchestras tune) . Which condition is correct?

What kind of operator is the <= operator?

What is the output of the following code snippet if the input is 25? Int i = 0; Scanner in = new Scanner(System.in) ; System.out.print("Enter a number: ") ; I = in.nextInt() ; If (i > 25) { I++; } Else { I--; } System.out.print(i) ;

In Java, which of the following orderings is used to compare strings?

The following code snippet contains an error. What is the error? If (cost > 100) ; { Cost = cost - 10; } System.out.println("Discount cost: " + cost) ;

What can be done to improve the following code fragment? If ((counter % 10) == 0) { System.out.println("Counter is divisible by ten: " + counter) ; Counter++; } Else { System.out.println("Counter is not divisible by ten: " + counter) ; Counter++; }

Assuming that the user provides 99 as input, what is the output of the following code snippet? Int a; Int b; a = 0; Scanner in = new Scanner(System.in) ; System.out.print("Please enter a number: ") ; b = in.nextInt() ; If (b > 300) { a = b; } else { a = 0; } System.out.println("a: " + a) ;