Why is printing garbage?

Question

fstream file;
file.open("hassan.txt",ios::out);
if (!file)
{
cout << "file not opened succesfully" << endl;
}
int b=98;
file << b;
string a;
file >> a;
cout << a;
return 0;

Answer 1

you are using C way of doing, which is incorrect in C++
Change :
!file
With :
!file.is_open()

Answer 2

seems logical, you entered an int, then read a string. If you want to cast the int to string, either use atoi function (C method, optimized but not generic) or use ostringstream like that :
#include <sstream>
#include <string>
...
osstringstream oss;
int a = 100;
std::string s;
oss << a;
s = oss.str();

Answer 3

You read from a file when it was opened in write only

Answer 4

No, in sololearn it is because the file do not exist
On your visual studio, it is because you need to add :
file.seekg(0,ios::beg);
Between writing and reading

Answer 5

https://code.sololearn.com/cR10J5EdlbsI/?ref=app

Answer 6

it is still outputting garbage

Answer 7

even if I use string b instead of int b still error occurs

Answer 8

yes it is ok
if I open it just once and use the flags like
ios::in|ios::out error occurs
(in sololearn file is not opening in visual studio file opens but there is output problem)
it means that we should not use ios:: out while oopening if we r reading from file???