.SH NOTES
The program must explicitly declare these symbols;
they are not defined in any header file.
-.PP
+.P
On some systems the names of these symbols are preceded by underscores,
thus:
.IR _etext ,
and
.IR _end .
These symbols are also defined for programs compiled on Linux.
-.PP
+.P
At the start of program execution,
the program break will be somewhere near
.I &end
with an argument of zero to find the current value of the program break.
.SH EXAMPLES
When run, the program below produces output such as the following:
-.PP
+.P
.in +4n
.EX
.RB "$" " ./a.out"