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Programming in C MCQ - Operators and Expressions

21 Which statement about a variable declared with the register storage-class specifier in C is correct?

The address-of operator cannot be applied to an object declared register. The register keyword also does not guarantee that the compiler will allocate a CPU register. Therefore, statements A and C are correct, making option D the correct answer.

22 The statement
int **a;

The declaration int *a; is valid C syntax. It declares a as a pointer to int. The declaration does not initialize the pointer, so its value must not be used before a valid pointer value is assigned. Therefore, option C is correct.

23 The operation of a staircase switch best explains the

First from the truth table of the exclusive OR operation. If both the switches are off i-e 0, 0 then the light will be off i-e, 0. So, 0, 0 yields 0. If you switch on either of the two switches i-e. 0 1 or 1 0, the light will be on. So, 0 1 yields 1 (so does 1 0 ). Now, if you switch on the other one, which is currently off, it will be 1 1. This should yield a 0. Compare these results with the truth table of XOR.

24 Which operator calculates the remainder after division?

The % operator is the remainder, or modulus, operator. It produces the remainder resulting from integer division.

25 Which operator is used for multiplication?

The asterisk (*) is the multiplication operator in C. The character x is not used as the multiplication operator.

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Question:

Operator precedence determines:

A. The variable name
B. The order in which operators are evaluated
C. The number of variables
D. The name of a function

Correct answer: B

Explanation:

Operator precedence establishes which operators bind or are evaluated before others when an expression contains operators of different precedence levels.

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