File IO

Faq.txt

Q1) What is difference between a and a+ mode?
ans: a - Append to a file.The file is created if it does not exist.
     a+ - Open a file for reading and appending. The file is created if it does not exist.

Q2) Is it mandatory to close the file after opening.
ans: Yes ,if we didn't close then it will leak file descriptors.

Q3) When we use File.open() ,what type of object is created?
ans: File object ,it can be check using .class function.

Q4) Does a mode create a new file if the file doesn't exist ?
ans Yes, it will create then the content will be append.

Mcq.txt

Q1) Which of the following is not a function of File IO?

a) writeLine
b) gets
c) puts
d) read

ans: a)write

Q2) Which mode is used to write at the end of the file ?

a) a
b) w
c) both a and b
d) None of the above

ans: a)

Q3) Which function is use to insert content in file ?

a) puts
b) write
c) Only a
d) both a and b

Q4) What will be the output of this program :
    
          f1=File.new("authors.txt","w")
          f1.puts "PK"
          f1.puts "RK"
          f1.puts "KK"
          f1.puts "LK"
          f1.close

          f1=File.open("authors.txt","w")
          f1.puts "ll"
          f1.close
          puts File.read("authors.txt")
          
a) ll
b) error
c) PK
   RK
   KK
   LK
d) PK
   RK
   KK
   LK
   ll
   
ans: a) ll