Writing and Reading all ASCII character from a file(Binary) using c++

#include<bits/stdc++.h>
using namespace std;
int main ()
{
    for(int i=0; i<256; i++)
    {
        fstream file("compress.bin", ios:: binary | ios::in | ios::out | ios:: trunc);
        char  c=i;
        file.write((char *)&c,sizeof(c));
        file.seekg(0);
        unsigned char p;
        file.read((char *)&p,sizeof(c));
        cout << p ;
        printf(" %d\n",p);
    }
}