Question

In: Computer Science

Write a program that allows the user to navigate the lines of text in a file....

Write a program that allows the user to navigate the lines of text in a file. The program should prompt the user for a filename and input the lines of text into a list. The program then enters a loop in which it prints the number of lines in the file and prompts the user for a line number. Actual line numbers range from 1 to the number of lines in the file. If the input is 0, the program quits. Otherwise, the program prints the line associated with that number.

An example file and the program input and output is shown below:

example.txt

Line 1.
Line 2.
Line 3.

Enter the input file name: example.txt

The file has 3 lines.
Enter a line number [0 to quit]: 2
2 :  Line 2.
The file has 3 lines.
Enter a line number [0 to quit]: 4
ERROR: line number must be less than 3.
The file has 3 lines.
Enter a line number [0 to quit]: 0

Make sure the program gracefully handles a user entering a line number that is too high.

Solutions

Expert Solution

Working code implemented in Python and appropriate comments provided for better understanding.

Source Code:

# Take the input file name
inName = input("Enter the input file name: ")

# Open the input file and read the text
inputFile = open(inName, 'r')
lines = list()
for line in inputFile:
lines.append(line)

# Loop for line numbers from the user until she enters 0
# and prints the line's number followed by the line
while True:
print("The file has", len(lines), "lines.")
if len(lines) == 0:
break
lineNumber = int(input("Enter a line number [0 to quit]: "))
if lineNumber == 0:
break
elif lineNumber >= len(lines):
print("ERROR: line number must be less than", len(lines))
else:
print(lineNumber, ": ", lines[lineNumber])

Code Screenshots:


Related Solutions

Write a program that allows the user to navigate the lines of text in a file....
Write a program that allows the user to navigate the lines of text in a file. The program should prompt the user for a filename and input the lines of text into a list. The program then enters a loop in which it prints the number of lines in the file and prompts the user for a line number. Actual line numbers range from 1 to the number of lines in the file. If the input is 0, the program...
Write a Java program that allows the user to specify a file name on the command...
Write a Java program that allows the user to specify a file name on the command line and prints the number of characters, words, lines, average number of words per line, and average number of characters per word in that file. If the user does not specify any file name, then prompt the user for the name.
C++ Code You will write a program to process the lines in a text file using...
C++ Code You will write a program to process the lines in a text file using a linked list and shared pointers. You will create a class “Node” with the following private data attributes: • Line – line from a file (string) • Next (shared pointer to a Node) Put your class definition in a header file and the implementation of the methods in a .cpp file. The header file will be included in your project. If you follow the...
Write a GUI-based program that allows the user to open, edit, and save text files. The...
Write a GUI-based program that allows the user to open, edit, and save text files. The GUI should include a labeled entry field for the filename and multi-line text widget for the text of the file. The user should be able to scroll through the text by manipulating a vertical scrollbar. Include command buttons labeled Open, Save, and New that allow the user to open, save and create new files. The New command should then clear the text widget and...
Python: Write a program that asks the user for the name of a file. The program...
Python: Write a program that asks the user for the name of a file. The program should display the contents of the file line by line.
Write a C++ program to create a text file. Your file should contain the following text:...
Write a C++ program to create a text file. Your file should contain the following text: Batch files are text files created by programmer. The file is written in notepad. Creating a text file and writing to it by using fstream: to write to a file, you need to open thew file as write mode. To do so, include a header filr to your program. Create an object of type fsrteam. Open the file as write mode. Reading from a...
Write a program that will ask for the user to input a filename of a text...
Write a program that will ask for the user to input a filename of a text file that contains an unknown number of integers. And also an output filename to display results. You will read all of the integers from the input file, and store them in an array. (You may need to read all the values in the file once just to get the total count) Using this array you will find the max number, min number, average value,...
Write a program that asks the user for a file name. The file contains a series...
Write a program that asks the user for a file name. The file contains a series of scores(integers), each written on a separate line. The program should read the contents of the file into an array and then display the following content: 1) The scores in rows of 10 scores and in sorted in descending order. 2) The lowest score in the array 3) The highest score in the array 4) The total number of scores in the array 5)...
Write a program that runs on SPIM that allows the user to enter the number of...
Write a program that runs on SPIM that allows the user to enter the number of hours, minutes and seconds and then prints out the total time in seconds. Name the source code file “seconds.asm
Write a program that runs on SPIM that allows the user to enter the number of...
Write a program that runs on SPIM that allows the user to enter the number of hours, minutes and seconds and then prints out the total time in seconds. Name the source code file “seconds.asm Explain step by step
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT