Make it compatible to other compilers

[sainipulkit0007]

This code can't run on any other compiler than Turbo c/c++.

1.) D:\Codeblocks\Library\main.cpp | fatal error: fstream.h: No such file or directory|

2.) clang++-7 -pthread -std=c++17 -o main main.cpp
main.cpp:2:9: fatal error: 'fstream.h' file not found
#include<fstream.h>
^~~~~~~~~~~
1 error generated.
compiler exit status 1

[theshubhagrwl]

Hi, I made a pull request to solve this issue
#4