binary/ bits representation of a character flushed into a text file

When a buffer is flushed into a textfile,does the (binary/bits of the character in the txt file correspond to the bits of the flushed buffer.Lets assume the flushed bufffer is an unsigned char.

e.g

Code:

---

ofstream f;
unsigned char a;
f.open("testing.txt")
 a='129'
 f<<a;
f.close;

---

Firstly, the value of '129' is implementation defined( three characters ).

About your question, yes when binary data is written to a file there( usually ) represent the data from which they came, they're not "translated". That's why if you write a 32-bit integer with binary mode in a file and you later open the file, you see 4 strange characters.