I'm having a difficulty with using negative exponents in the program bc
in Bash. If I execute echo "2*1.86929*10^05" | bc
echo "2*1.86929*10^05" | bc
, I get a result of 373858.00000
while if I execute echo "2*1.86929*10^-05" | bc
echo "2*1.86929*10^-05" | bc
, I get a result only of 0
. How can I get better accuracy when using negative exponents?
By default, the output of bc
is rounded to an integer. To keep the decimal part of the result, use bc -l
, like this:
$ echo "2*1.86929*10^-05" | bc -l
.00003738580000000000
You need to set the value of "scale" - so
scale=50
2*1.86929*10^-05
Gives .00003738580000000000000000000000000000000000000000
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