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Ruby program to open a file in read-write mode with truncating file

Ruby Example: Write a program to open a file in read-write mode with truncating file.
Submitted by Nidhi, on February 11, 2022

Problem Solution:

In this program, we will open a file in read-write mode using the File class in 'w+' mode. The 'w+' mode truncates the existing file. Then we will read and write data into the file.

Program/Source Code:

The source code to open a file in read-write mode with truncating file is given below. The given program is compiled and executed on Windows 10 Operating System successfully.

# Ruby program to open a file in 
# read-write mode with 
# truncating file

# Open file in read-write mode.
fobj = File.new("MyFile.txt", "w+"); 

print "File opened in read write mode.\n";

# Read data from file
puts fobj.read();

# Write data into file
fobj.syswrite("Delhi\n");

# Close file object
fobj.close();  

# Open file in read mode.
fobj = File.new("MyFile.txt", "r"); 

print "File opened in read mode.\n";

# Read data from file
puts fobj.read();

# Close file object
fobj.close();  

Output:

File opened in read write mode.

File opened in read mode.
Delhi

Explanation:

In the above program, we opened a file "MyFile.txt" in read-write mode ('w+') by creating object fobj of the File class. The 'w+' mode truncates the existing file. Then we read data from the file and write data into the file. After that, we read the updated file and printed the result.

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