this is me code, i need strlen to recognise the sapces, how do you do this.

Code:
#include <iostream>
#include <fstream>

using namespace std;

int main () {


	char * buffer;
	char tbuffer[100];
	int len;
	int leng;

	ofstream a;
	a.open("test.txt",ios::binary);

cout<<"please type a sentence > ";
cin>> tbuffer;
len=strlen(tbuffer);
a.write(tbuffer,len);
tbuffer[len]=0;
cout<< strlen(tbuffer);
cin.get();
a.close();


}