Can I use -data-evaluate-expression to evaluate sin(4.1)?

[Nick Roberts]

 > -data-evaluate-expression sin(5.1)
 > ^done,value="3"
 > (gdb)
 > 
 > 
 > Can I use "-data-evaluate-expression" to evaluate
 > sin(x) function? If yes, why it returns a wrong
 > "int" value?

By default (without debuginfo as Frederic says) it assumes sin takes an
integer argument and returns an value (I think).

You need to cast sin explicitly:

 (gdb)
-data-evaluate-expression "((double ((*) (double))) sin) (5.1)"
^done,value="-0.92581468232773245"
(gdb)
-data-evaluate-expression "((double ((*) (double))) sin) (4.1)"
^done,value="-0.81827711106441026"


-- 
Nick                                           http://www.inet.net.nz/~nickrob