Write a program to read a set of integers from an input data file, and locate the largest and smallest values within the data file. Print out the largest and smallest values, together with the lines on which they were found. Assume that you do not know the number of values in the file before the file is read.

To write a program that reads a set of integers from an input data file, locates the largest and smallest values, and prints out the values along with the lines on which they were found, here is a Python solution: 1. Open the data file using `file = open('data.txt')`. 2. Initialize variables: `min_value`, `max_value`, `min_lines`, `max_lines`, and `line_number`. 3. Read the file line by line using `for line in file:` and convert each line to an integer. 4. Compare each number with `min_value` and `max_value`. Update the values and their respective line numbers accordingly. 5. Print the smallest and largest values, and their respective line numbers. Here's the complete code: ```python file = open('data.txt') min_value = None max_value = None min_lines = [] max_lines = [] line_number = 0 for line in file: number = int(line) line_number += 1 if min_value is None or number < min_value: min_value = number min_lines = [line_number] elif number == min_value: min_lines.append(line_number) if max_value is None or number > max_value: max_value = number max_lines = [line_number] elif number == max_value: max_lines.append(line_number) print(f'The smallest number is {min_value} found on lines {min_lines}') print(f'The largest number is {max_value} found on lines {max_lines}') ```