Operators and Expressions - C Programming MCQ Questions and Answers

In C and many programming languages, mathematical expressions follow the operator precedence rules. Multiplication (*) and division (/) have higher precedence than addition (+) and subtraction (-).

So, when evaluating the expression "5 + 7 * 2," the multiplication is performed before addition:

5 + (7 * 2) = 5 + 14 = 19

Therefore, the result of the expression "5 + 7 * 2" in C is Option A: 19.

In C, the || operator is used for logical OR. It returns true (1) if at least one of the operands is true, otherwise, it returns false (0).

Option A (&&) represents the logical AND operator.
Option B (|) represents the bitwise OR operator.
Option C (&) represents the bitwise AND operator in C.

Therefore, Option D (|| ) is the correct answer.

When the ++ operator is applied to a variable in C, it increments the value of the variable by 1.

Option A (Decrements by 1) is incorrect as the ++ operator increases the value.
Option C (Doubles the value) is incorrect as the ++ operator adds 1, not doubles the value.
Option D (Leaves it unchanged) is incorrect as the ++ operator explicitly increments the variable's value by 1.

In C, the % (modulo) operator is used for modulus division. It calculates the remainder when one number is divided by another.

Option B (/) is incorrect as it represents regular division.
Option C (*) is incorrect as it represents multiplication.
Option D (&) is incorrect as it represents the bitwise AND operator, not modulus division.

In C, when you perform integer division, as in the expression 8 / 3, it results in the quotient without any decimal places. Therefore, the result is 2.

Option B (2.67) is incorrect as it would be the result of floating-point division.
Option C (3) is incorrect because it would be the result of rounding up in floating-point division.
Option D (3.5) is incorrect because it would be the result of floating-point division.

In C, the arithmetic operators have a specific order of precedence. Multiplication has the highest precedence, followed by division, and then addition and subtraction. This order ensures that expressions are evaluated in the correct mathematical order.

In C, arithmetic expressions follow the order of precedence, where multiplication and division have higher precedence than addition and subtraction. Therefore, in the expression 10 - 5 * 2, the multiplication (5 * 2) is performed first, resulting in 10 - 10, which indeed equals 0.

In C, the == operator is used for equality comparison. It checks if the two operands are equal and returns true if they are, otherwise, it returns false.

Option B (=) is incorrect as it is the assignment operator, used to assign values to variables, not for equality comparison.
Option C (!=) is incorrect as it is the "not equal to" operator, used to check if two values are not equal.
Option D (<>) is not a valid equality comparison operator in C.

In C, the sizeof operator returns the size in bytes of the data type or variable provided as its operand. It is often used to determine the amount of memory occupied by a variable or data type.

Option A (Size of an array) is incorrect because sizeof returns the size of the data type or variable, not specifically for arrays.
Option C (Size of a pointer) is partially correct; sizeof can be used to determine the size of a pointer data type or a variable, but it is not limited to just pointers.
Option D (Size of a function) is incorrect because sizeof does not apply to functions in C.

In C, arithmetic expressions follow the order of operations (PEMDAS/BODMAS), where parentheses have the highest precedence. Therefore, the expression (6 - 2) is evaluated first, resulting in 4, and (1 + 2) is evaluated as 3. Then, these results are multiplied: 4 * 3, which equals 12