How I get after decimal point three value with round

Question

suppose I have value

double val=0.12345

 

i want round value from decimal third digit.

 

i want to get value with round

 

expected answer result = 0.123

 

if double vale=0.1235

ans result=0.124

 

if double val=0.1111

ans result=0.111

 

How I get the result?

 

please anyone guide me.