question about file handling

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C++

#include <iostream.h>
#include <fstream.h>
#include <conio.h>
void main()
{
clrscr();
char ch;
ofstream sc;
sc.open("om.txt");
while(ch!='1')   //here is the problem
{
ch=getche();
sc.put(ch);


}
sc.close();
getch();
}

The above enters one character at a time in text file om.txt. Problem is that program is not correctly teriminated when i press two time 1 then program terimate