The integer part of r is 0 , the nth decimal place of r is 1 if the nth decimal place of r is not 1 .
The nth decimal place of r is 2 if the nth decimal place of r is 1 .
The integer part of r is 0 , the nth decimal place of r is 1 if the nth decimal place of r is not 1 , and the nth decimal place of r is 2 if the nth decimal place of r is 1 .