Number Operations and Properties

Evaluating a list literal inside parenthesized syntax in a scalar context triggers the comma operator, which discards all but the last element. Thus, $scalar is assigned 30. Distractors like 10 or 3 assume array size or first-element behavior.

The prefix increment ++$val changes $val from 26 to 27. The comma operator in scalar context evaluates the left expression, discards it, and returns the evaluation of the right expression, which is $val + 5, resulting in 27 + 5 = 32.

CEILING(-10.4) returns the smallest integer greater than or equal to -10.4, which is -10. The CEILING function rounds up towards zero for negative numbers.

X is defined as PIC 99 (2-digit integer). When SUBTRACT 20 FROM X executes, X starts at 10, and 10 - 20 = -10. Since PIC 99 cannot hold negative values, COBOL truncates/ignores the sign, resulting in 10. No error occurs - this is how COBOL handles overflow in unsigned fields.

Due to integer division in C/C++, 7/9 evaluates to 0. Multiplying 0 by 9 yields 0. Floats or doubles are not used unless explicitly cast or written as literals like 7.0.

For a valid range of 18-25, the equivalence classes are: valid (18-25), invalid below (less than 18), and invalid above (greater than 25). Option A (17) is invalid because it's below the minimum valid value of 18. Options B (19), C (24), and D (21) are all valid values within the accepted range.

The pattern involves reversing both numbers, then adding corresponding digits column-wise: reverse(137)=731, reverse(276)=672. Adding column digits: 7+6=13, 3+7=10, 1+2=3 gives 1-3-10-3, which rearranges to 1623. This pattern applied to 731+672: reverse(731)=137, reverse(672)=276, adding column digits: 1+2=3, 3+7=10, 7+6=13 gives 3-10-13, rearranging to 1623.

In this expression, AND and OR are bitwise operators. 42 in binary is 00101010, 72 is 01001000, 55 is 00110111. (42 OR 72) = 01101010 = 106. Then 106 AND 55 = 00100010 = 34. The result is 34.

 Since MSB of a is 1, 2's complement of A = 0000 0110. Therefore A = -6 B = 10. A x B = -60 Since a negative number we have to find the 2's complement of -60 Represent -60 in 2's complement. Binary of 60 = 0011 1100 2's complement = 1100 0100

In 97, digit at tens place is 9 and decider is 7, which is greater than 5. Thus, 97 rounded off to the nearest ten is 100.

32000 = 3.2 × 10000 = 3.2 × 10^4. The decimal point moved 4 places to the left (from after the last zero to between 3 and 2), giving exponent 4.