c++ string prob

hi could some body help me?
im making a program that writes in a file.txt
how can i compare my "char x" to another char?

#include<iostream>
#include<fstream>
#include<string.h>
using namespace std;

int main()
{

char x[100]; 
char y[100];





cout << "enter title" << endl;
gets(y);
ofstream rave(y, ios::out);

cout << "enter word" << endl;
do
{
gets(x);
if (x!= (?))  // <= i need something that "char x" could be compare to so //that my  if comd will execute
{
rave << x;
}

}while(x != (?)); // <= same above

rave.close();

}