Expresii C++
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Questions and Answers
- 1.
Care din următoarele expresii furnizează rezultatul 1 dacă a şi b sunt ambele pozitive:
- A.
(a > 0) && (a > b)
- B.
a*b > 0
- C.
(a*b > 0) && (b > 0)
- D.
(a > 0) || (b>0)
Correct Answer
C. (a*b > 0) && (b > 0)Explanation
The expression (a*b > 0) && (b > 0) will provide the result 1 if both a and b are positive. This is because the first part of the expression, (a*b > 0), checks if the product of a and b is greater than 0, which means both numbers have the same sign (either both positive or both negative). The second part of the expression, (b > 0), checks if b is also positive. Therefore, this expression ensures that both a and b are positive, resulting in the answer 1.Rate this question:
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- 2.
Considerăm că variabila a are valoarea –13. Cărui tip poate aparţine această variabilă:
- A.
Double
- B.
Unsigned int
- C.
Long
- D.
Char
Correct Answer
C. LongExplanation
The variable "a" can be of type "long" because it can store negative values, such as -13, and "long" is capable of storing larger ranges of numbers, including negative values.Rate this question:
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- 3.
Care din următoarele expresii au valoarea 1 :(alegeti 2 variante)
- A.
(3 < 7) && (2 < 0) || (6 = = 4)
- B.
(3 < 7) || (2 < 0) || (6 = = 4)
- C.
! (2 < 0) || (6 = = 4)
Correct Answer(s)
B. (3 < 7) || (2 < 0) || (6 = = 4)
C. ! (2 < 0) || (6 = = 4)Explanation
The correct answer is "(3 < 7) || (2 < 0) || (6 = = 4), ! (2 < 0) || (6 = = 4)". In the first expression, (3 < 7) is true, (2 < 0) is false, and (6 = = 4) is false. The second expression, (3 < 7) is true, (2 < 0) is false, and (6 = = 4) is false. The third expression, (2 < 0) is false, and (6 = = 4) is false. Therefore, the first two expressions evaluate to true because of the "||" operator, and the third expression evaluates to false because of the "!" operator.Rate this question:
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- 4.
Dacă a, b, c, d sunt variabile de tip int, ce valoare are expresia :E = a/b/c – d, dacăa=36, b=6, c=6, d=4?
Correct Answer(s)
-3Explanation
The given expression calculates the value of E by first dividing a by b, then dividing the result by c, and finally subtracting d from it. In this case, a=36, b=6, c=6, and d=4. So, the expression evaluates to (36/6/6) - 4 = 1 - 4 = -3. Therefore, the value of E is -3.Rate this question:
- 5.
Care este valoarea expresiei alăturate?ABS(-11.2) + SQRT(TRUNC(16.23))
- A.
-9.2
- B.
15
- C.
15.2
- D.
14.2
Correct Answer
C. 15.2 -
- 6.
Care dintre următoarele expresii are valoarea 1 dacă şi numai dacă numărul real memorat în variabila x se află în intervalul (-2,2)?
- A.
x*x-4
- B.
4-x*x>0
- C.
(x-2)*(x+2)>0
- D.
( 2< x ) && ( x< -2)
Correct Answer
B. 4-x*x>0Explanation
The expression "4-x*x>0" has a value of 1 if and only if the real number stored in variable x is within the interval (-2,2). This expression represents the condition that the square of x subtracted from 4 is greater than 0, which means that x must be either less than -2 or greater than 2 in order for the expression to be true. Therefore, if x is within the interval (-2,2), the expression will be false and have a value of 0.Rate this question:
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- 7.
Indicați expresia care are valoarea 1 dacă și numai dacă numărul natural memorat în variabila întreagă x are exact două cifre.
- A.
X>9 && x
- B.
X>9 || x
- C.
x>9 || x
- D.
x>10 && x
Correct Answer
A. X>9 && xExplanation
The expression "x>9 && x" has a value of 1 if and only if the natural number stored in the integer variable x has exactly two digits. This is because the expression "x>9" checks if x is greater than 9, which ensures that x has at least two digits. The "&&" operator then checks if x is also less than 100, ensuring that x has exactly two digits and not more. Therefore, the expression "x>9 && x" evaluates to true only when x has exactly two digits.Rate this question:
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- 8.
Care este rezultatul evaluarii expresiei de mai jos?10 * 2 / 3 * 3 / 2*5
- A.
9
- B.
45
- C.
10
- D.
1.11
Correct Answer
B. 45Explanation
The expression can be simplified using the order of operations (PEMDAS/BODMAS). First, we perform the multiplication and division from left to right. 10 * 2 = 20, 20 / 3 = 6.6667, 6.6667 * 3 = 20, and 20 / 2 = 10. Then, we perform the remaining multiplication from left to right. 10 * 5 = 50. Therefore, the result of the expression is 50.Rate this question:
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- 9.
Stabiliti cae dintre expresiile urmatoare atribuie variabilei reale m valoarea mediei aritmetice anumerelor intregi x si y?
- A.
M=(x+y)/2.0
- B.
M=x+y/2
- C.
M=x/2+y/2
- D.
M==(x+y)/2
Correct Answer
A. M=(x+y)/2.0Explanation
The correct answer is m=(x+y)/2.0. This expression assigns the variable m the value of the arithmetic mean of the integers x and y. The use of the decimal point after the 2 ensures that the division is done as a floating-point operation, resulting in a more precise average value.Rate this question:
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Jul 22, 2024Quiz Edited by
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