QUESTION 5 - JAVA (TRUE/FALSE) A variable is a location in the computer’s memory
ID: 3758607 • Letter: Q
Question
QUESTION 5 - JAVA (TRUE/FALSE)
A variable is a location in the computer’s memory.
In the process X = X + X the variable X represents a legal Counter.
An if-then structure “inside” of a while-loop structure is an example of nested loops.
By convention, variables in Java should always begin with a small letter.
In a math formula, the “order of operations” states that addition and subtraction are performed before division.
A counter variable is always incremented by a whole number.
In general, the same statement(s) will appear in both the "true part" as well as the "false part" of an if-then-else.
A while-loop tests the condition at the end of the loop.
In Java, the opposite of > is <
In order to directly translate a flowchart into Java code, the flowchart MUST be structured.
Explanation / Answer
A variable is a location in the computer’s memory.
A variable is a named storage location. A variable is associated with type and a value.
A variable may be of type int, char, float, etc…
Based on the type, memory is allocated for the variable in the main memory and the value of the variable is stored in the allocated location.
Thus, the statement “A variable is a location in the computer’s memory.” is true.
2. In the process X = X + X the variable X represents a legal Counter.
The given statement is X=X+X. this is a legal statement, because each time x is incremented by x
Thus, the statement “X is a legal counter” is true.
3. An if-then structure “inside” of a while-loop structure is an example of nested loops.
Generally, we have three types of loops, namely, for, while, do-while.
If any one of the loop is nested one or many time in any of these three loops, then the structure is called nested-loop.
If-then structure is not a loop, but it is a control structure.
Thus, the statement” An if-then structure “inside” of a while-loop structure is an example of nested
loops.” is false.
4. By convention, variables in Java should always begin with a small letter.
By convention, a variable in java should be made up of one or many words with no spaces between words.
And the camel-case is used for representing a variable. That is, the first word in the variable name must be in lowercase and the remaining words in the variable name must be initial-capitalized. Example: sumOfNumbers.
Thus the statement “By convention, variables in Java should always begin with a small letter.” is true.
5. In a math formula, the “order of operations” states that addition and subtraction are performed before division.
The order of evaluation or operations used in math and many other fields is as follows:
Evaluating exponents and roots.
Evaluating multiplication and division
Evaluating addition and subtraction.
Thus, the statement “that addition and subtraction are performed before division.” is false.
6. A counter variable is always incremented by a whole number.
A counter variable may be incremented by an integer or incremented by a real value also.
Example. X=X+2. Y= Y+(-2)=Y-2. Y= Y+2.5. Y= Y%5. Etc..
Thus, the statement “A counter variable is always incremented by a whole number.” is false.
7. In general, the same statement(s) will appear in both the "true part" as well as the "false part" of an if-then-else.
If-then-else structure is a choice based control structure.
The syntax of if-then-else:
If <condition> then
Statements set 1
Else
Statements set 2
If the condition is true, statements set1 is executed, otherwise, the statements set 2 will be executed.
Generally, statements set 1 is not equal to statements set 2.
Thus, the statement “the same statement(s) will appear in both the "true part" as well as the "false part" of an if-then-else” is false.
8. A while-loop tests the condition at the end of the loop.
The syntax for the while loop is
While <condition> do
Statement 1
Statement 2
.
.
.
End of while
If the condition is true , the control enters into the loop and executes statements. After all the statements are executed, the condition is tested again. If the condition still true, the statements are executed once again. These steps are repeated , until the condition is false.
Thus, the statement “A while-loop tests the condition at the end of the loop. ” is true.
9. In Java, the opposite of > is <
In java, > and < are relational operator. These are used to find a relation between two values.
If A > B is true, then A <B is false
If A < B is true, then A > B is false.
Thus, the statement “the opposite of > is <” is true.
10. In order to directly translate a flowchart into Java code, the flowchart MUST be structured.
The flow chart and algorithms are the generalized representations to solve a problem. a program is generated according to the algorithm or a flow chart.
Thus, the statement “In order to directly translate a flowchart into Java code, the flowchart MUST be structured. ” is true.
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