a =12345678901234567890.12 a*10 echo $a 12345678901234567890.12 ????
a =12345678901234567890.12 a*=10 echo $a 12345678901234567891.2
a =12345678901234567890.12 a*10 echo $a 12345678901234567890.12 ????
a =12345678901234567890.12 a*=10 echo $a 12345678901234567891.2