ExamAdept

Every operator has an Associativity

A:

Yes

B:

No

C:

D:

Answer: A

Yes, Each and every operator has an associativity.

The associativity (or fixity) of an operator is a property that determines how operators of the same precedence are grouped in the absence of parentheses. Operators may be left-associative, right-associative or non-associative.

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Will the expression *p = p be disallowed by the compiler?

A:

Yes

B:

No

C:

D:

Answer: B

Because, here even though the value of p is accessed twice it is used to modify two different objects p and *p

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Two different operators would always have different Associativity.

A:

Yes

B:

No

C:

D:

Answer: B

No, Two different operators may have same associativity.

Example:
Arithmetic operators like ++, -- having Right-to-Left associativity.
Relational operators like >, >= also have Left-to-Right associativity.

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Are the following two statement same?

1.	a <= 20 ? (b = 30): (c = 30);
2.	(a <=20) ? b : (c = 30);

A:

Yes

B:

No

C:

D:

Answer: B

No, the expressions 1 and 2 are not same.

1. a <= 20 ? (b = 30) : (c = 30); This statement can be rewritten as,


if(a <= 20)
{
    b = 30;
}
else
{
    c = 30;
}

2. (a <=20) ? b : (c = 30); This statement can be rewritten as,


if(a <= 20)
{
    //Nothing here
}
else
{
    c = 30;
}

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Associativity of an operator is either Left to Right or Right to Left.

A:

True

B:

False

C:

D:

Answer: A

Yes, the associativity of an operator is either Left to Right or Right to Left.

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Questions for: Expressions