a=1/0
b=-1/0
c=sqrt(-1)
d=0/0
e=(+Inf)+(-Inf)
f=log(-2)
g=log(0)
h=exp(1.0e2)
i=exp(1.0e3)
2^1023
2^1024
log(2^1023)
exp(709)
exp(710)