Program : use of file in C++

Write a program to implement I/O operations on characters. I/O operations includes inputing a string, Calculating length of the string, Storing the String in a file, fetching the stored characters from it, etc.

#include<iostream.h>
#include<fstream.h>
#include<string.h>
int main()
{ 
char string[80]; 
cout<<"Enter a String \n"; 
cin>>string; 
int len = strlen(string);
fstream file; 
file.open("TEXT", ios::in | ios::out);
for(int i=0;i<len;i++) 
file.put(string[i]);
file.seekg(0);
char ch; 
while(file) 
{ 
file.get(ch); 
cout<<ch; 
} 
return 0;
}