GDB : compute double with print

Question

I would like to make some computation with gdb when my program is at a breakpoint.

But here is my problem :

(gdb) call 2,6*2
$26 = 12

It doesn't compute at all double.

How can I say gdb to compute doubles ?

Thank you.

Answer 1

(gdb) call 2,6*2
$26 = 12
It doesn't compute at all double.

It's not supposed to: you gave the GDB call command a comma-expression, which it correctly evaluated.

You probably want:

(gdb) print 2.6 * 2
$1 = 5.1999999999999993

or

(gdb) call 2.6 * 2
$2 = 5.1999999999999993