Expresii C++

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| By Cucuiet
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Cucuiet
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Quizzes Created: 2 | Total Attempts: 2,899
Questions: 9 | Attempts: 1,717

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Expresii C++ - Quiz

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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.

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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. Long
    Explanation
    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.

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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.

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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)
    -3
    Explanation
    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.

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  • 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>0
    Explanation
    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.

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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 && x
    Explanation
    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.

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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. 45
    Explanation
    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.

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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)/2.0
    Explanation
    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.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 30, 2014
    Quiz Created by
    Cucuiet
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