everest% CC fptr4.C
everest% 

everest% a.out
&x = 0xffffffadf8
&m = 0xffffffadf0
&n = 0xffffffadf4

After add3(&m), m = 5
After add5(&x), x = 10

Applying add3 to m, m = 8
Applying add5 to x, x = 15

Applying fptr to m, m = 11
Applying fptr to x, x = 20
Applying fptr to m, m = 1075052544
n = 0
everest%