Read file line by line using C++

This is a C++ program to read file line by line.

Input

tpoint.txt is having initial content as
"Tutorials point."

Output

Tutorials point.

Algorithm

Begin
   Create an object newfile against the class fstream.
   Call open() method to open a file "tpoint.txt" to perform write operation using object newfile.
   If file is open then
      Input a string "Tutorials point" in the tpoint.txt file.
      Close the file object newfile using close() method.
   Call open() method to open a file "tpoint.txt" to perform read operation using object newfile.
   If file is open then
      Declare a string "tp".
      Read all data of file object newfile using getline() method and put it into the string tp.
      Print the data of string tp.
Close the file object newfile using close() method.
End.

Example

<span class="com">#include</span><span class="pln"> </span><span class="str"><iostream></span><span class="pln">
</span><span class="com">#include</span><span class="pln"> </span><span class="str"><fstream></span><span class="pln">
</span><span class="com">#include</span><span class="pln"> </span><span class="str"><string></span><span class="pln">
</span><span class="kwd">using</span><span class="pln"> </span><span class="kwd">namespace</span><span class="pln"> std</span><span class="pun">;</span><span class="pln">
</span><span class="kwd">int</span><span class="pln"> main</span><span class="pun">(){</span><span class="pln">
   fstream newfile</span><span class="pun">;</span><span class="pln">
   newfile</span><span class="pun">.</span><span class="pln">open</span><span class="pun">(</span><span class="str">"tpoint.txt"</span><span class="pun">,</span><span class="pln">ios</span><span class="pun">::</span><span class="kwd">out</span><span class="pun">);</span><span class="pln">  </span><span class="com">// open a file to perform write operation using file object</span><span class="pln">
   </span><span class="kwd">if</span><span class="pun">(</span><span class="pln">newfile</span><span class="pun">.</span><span class="pln">is_open</span><span class="pun">())</span><span class="pln"> </span><span class="com">//checking whether the file is open</span><span class="pln">
   </span><span class="pun">{</span><span class="pln">
      newfile</span><span class="pun"><<</span><span class="str">"Tutorials point \n"</span><span class="pun">;</span><span class="pln">   </span><span class="com">//inserting text</span><span class="pln">
      newfile</span><span class="pun">.</span><span class="pln">close</span><span class="pun">();</span><span class="pln">    </span><span class="com">//close the file object</span><span class="pln">
   </span><span class="pun">}</span><span class="pln">
   newfile</span><span class="pun">.</span><span class="pln">open</span><span class="pun">(</span><span class="str">"tpoint.txt"</span><span class="pun">,</span><span class="pln">ios</span><span class="pun">::</span><span class="kwd">in</span><span class="pun">);</span><span class="pln"> </span><span class="com">//open a file to perform read operation using file object</span><span class="pln">
   </span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">newfile</span><span class="pun">.</span><span class="pln">is_open</span><span class="pun">()){</span><span class="pln">   </span><span class="com">//checking whether the file is open</span><span class="pln">
      </span><span class="kwd">string</span><span class="pln"> tp</span><span class="pun">;</span><span class="pln">
      </span><span class="kwd">while</span><span class="pun">(</span><span class="pln">getline</span><span class="pun">(</span><span class="pln">newfile</span><span class="pun">,</span><span class="pln"> tp</span><span class="pun">)){</span><span class="pln"> </span><span class="com">//read data from file object and put it into string.</span><span class="pln">
         cout </span><span class="pun"><<</span><span class="pln"> tp </span><span class="pun"><<</span><span class="pln"> </span><span class="str">"\n"</span><span class="pun">;</span><span class="pln"> </span><span class="com">//print the data of the string</span><span class="pln">
      </span><span class="pun">}</span><span class="pln">
      newfile</span><span class="pun">.</span><span class="pln">close</span><span class="pun">();</span><span class="pln"> </span><span class="com">//close the file object.</span><span class="pln">
   </span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span>

Output

Tutorials point.