Question 41

To output 2 ^ (x + y), the first step is to calculate r = 2 * r.

Starting with the calculation of r = 2 * r is essential in this process, as it sets up the variable for the exponential function that follows.

A) Declare variable r

Declaring the variable r is a necessary initial step in programming. However, this choice does not directly contribute to the calculation of the expression 2 ^ (x + y), which requires the computation of r based on x and y before any output can occur.

B) r = x + y

While this step is crucial in determining the value of r, it is not the immediate next step after the task of calculating 2 * r. The expression 2 * r is essential to achieve the final output of 2 raised to the power of the sum of x and y.

C) r = 2 * r

This option is the correct answer as it directly involves the core calculation needed to derive the output of 2 ^ (x + y). By multiplying 2 with r, which would have been computed in the previous step, this action is crucial to obtaining the result of the expression.

D) Output r

Outputting r is the final step of the sequence. It follows the calculation of r, but it cannot occur until the value of r has been determined. Therefore, it cannot be the first step in the order of tasks needed to produce the desired output.

Conclusion

The correct answer, r = 2 * r, is essential for producing the output of 2 ^ (x + y) as it directly addresses the required operation. The other options either precede or follow this calculation and do not contribute directly to achieving the final output in the correct sequence. Thus, C is the definitive choice for the task order.