Question

Read floating-point numbers from input until a floating-point number is read that is not in the range −5.0 to 45.0, both exclusive. Then, find the sum of all the floating-point numbers read before the floating-point number that causes reading to stop. Lastly. output the sum, ending with a newline Ex. If the input is −1.21.02.9−45.71.5, then the output is: 2.7 sumvalid is initialized to 0.0. A while loop reads floating-point numbers from input until a floating-point number is read that is not in the range- 5.0 to 45.0, both exclusive. If a floating-point number is in the given range, sumvalid is increased by the floating-point number's value

Answer 1

The student's question is related to writing a loop in programming to sum floating-point numbers within a specific range and output the sum following rounding rules based on significant figures, without prematurely rounding intermediate values.

Step-by-step explanation:

The question asks to write a loop that would read floating-point numbers until one is encountered that is not within the exclusive range of −5.0 to 45.0. Once a number outside that range is read, the loop should end, and the sum of all valid numbers (within the range) read up to that point must be calculated and outputted. The sum should follow rounding rules according to the significant figures of the numbers involved.

For example, when adding and subtracting, the final answer should preserve the same number of decimal places as that of the number with the smallest number of decimal places among the original numbers presented. So, 13.2 + 12.252 should be rounded to 25.5 to maintain a single decimal place accuracy. On the other hand, multiplication and division results should be rounded off to the least number of original significant figures, thus 1.35 x 2.1 should be rounded to 2.8 after the calculation.

It's important not to round off intermediate numbers prematurely to avoid inaccuracies in the final result. If we consider the example given, rounding intermediate numbers would give an incorrect final answer of 71 instead of a more accurate 72.