Question

1. Floating point representations in computers are exact, and are not prone to small floating point inaccuracies.

True

False

2.

The difference between a declared variable and a declared constant is that a constant’s value can vary at run-time, but a declared variable’s value cannot ever be changed after it is initialized

True

False

3.

The expression:

72 > 116 || 27 > 15

evaluates at run-time to true.

True

False

4.

The expression:

4 > 8 && 2 < 2 * 1

evaluates at run-time to false.

True

False

5.

The expression:

7 + 1 >= 8 && 12 < 2 * 6

evaluates at run-time to true.

True

False

Answer 1

Question 1:
Floating-point representations in computers are exact and are not prone to small floating-point inaccuracies.
Ans: False

It is not true that the floating-point representations in the computer are exact. The precision is not accurate, a floating-point value is APPROXIMATELY equal to 16 significant decimal digits.

Question 2:
The difference between a declared variable and a declared constant is that a constant’s value can vary at run-time, but a declared variable’s value cannot ever be changed after it is initialized
Ans: False

Once we define a variable as constant, we can change its value either in the program or during run-time whereas the declared variable value might change anywhere anytime in the program.

Question 3:
The expression:
72 > 116 || 27 > 15 evaluates at run-time to true.
Ans: True

Take the expression: 72 > 116 || 27 > 15
72>116 is false and 27>15 is true. for Logical OR any one of the statements is true then the result is true.

Question 4:
The expression: 4 > 8 && 2 < 2 * 1 evaluates at run-time to false.
Ans: True

Take the expression: 4 > 8 && 2 < 2 * 1
4>8 is false and 2>2 is also false. for Logical AND any one of the statements is false then the result is false.

Question 5:
The expression: 7 + 1 >= 8 && 12 < 2 * 6 evaluates at run-time to true.
Ans: False

Take the expression: 7 + 1 >= 8 && 12 < 2 * 6
8>=8 is true and 12<12 is false. for Logical AND any one of the statements is false then the result is false.

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