How to read the string into a file C++ - c++

Question

i have a little problem on writing the string into a file,
How can i write the string into the file and able to view it as ascii text?
because i am able to do that when i set the default value for str but not when i enter a str data
Thanks.
#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
int main()
{
fstream out("G://Test.txt");
if(!out) {
cout << "Cannot open output file.\n";
return 1;
}
char str[200];
cout << "Enter Customers data seperate by tab\n";
cin >> str;
cin.ignore();
out.write(str, strlen(str));
out.seekp(0 ,ios::end);
out.close();
return 0;
}

Answer 1

Please use std::string:
#include <string>
std::string str;
std::getline(cin, str);
cout << str;
I'm not sure what the exact problem in your case was, but >> only reads up to the first separator (which is whitespace); getline will read the entire line.

Answer 2

Just note that >> operator will read 1 word.
std::string word;
std::cin >> word; // reads one space seporated word.
// Ignores any initial space. Then read
// into 'word' all character upto (but not including)
// the first space character (the space is gone.
// Note. Space => White Space (' ', '\t', '\v' etc...)

Answer 3

You're working at the wrong level of abstraction. Also, there is no need to seekp to the end of the file before closing the file.
You want to read a string and write a string. As Pavel Minaev has said, this is directly supported via std::string and std::fstream:
#include <iostream>
#include <fstream>
#include <string>
int main()
{
std::ofstream out("G:\\Test.txt");
if(!out) {
std::cout << "Cannot open output file.\n";
return 1;
}
std::cout << "Enter Customer's data seperated by tab\n";
std::string buffer;
std::getline(std::cin, buffer);
out << buffer;
return 0;
}
If you want to write C, use C. Otherwise, take advantage of the language you're using.

Answer 4

I can't believe no one found the problem. The problem was that you were using strlen on a string that wasn't terminated with a null character. strlen will keep iterating until it finds a zero-byte, and an incorrect string length might be returned (or the program might crash - it's Undefined Behavior, who knows?).
The answer is to zero-initialize your string:
char str[200] = {0};
Supplying your own string as the value of str works because those in-memory strings are null-terminated.