Which header file is used for reading and writing to a file?

1.	Which header file is used for reading and writing to a file?
A.	#include <fstream>
B.	#include <file>
C.	#include <iostream>
D.	All of above
E.	None of these
Answer» B. #include <file>

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What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> using namespace std; int main () { char First_ch, Second_ch, Third_ch; cout << "Enter any word or number: "; First_ch = cin.get(); cin.sync(); Second_ch = cin.get(); cin.sync(); Third_ch = cin.get(); cout << First_ch << endl; cout << Second_ch << endl; cout << Third_ch << endl; return 0; } </pre>
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What is the output of this program in the text file? <pre class="prettyprint lang-c">#include <stdio.h> int main () { FILE * ptr; char buff[] = { 'I' , 'L' , 'U' }; ptr = fopen ( "Example.txt" , "wb" ); fwrite (buff , 1 , sizeof(buff) , ptr ); fclose (ptr); return 0; } </stdio.h></pre>
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Which header file is used for reading and writing to a file?

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