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Fix bc error with scientific numbers in txfee_calc #611

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@mccwdev mccwdev commented Mar 25, 2024

bitcoin-cli sometimes returns scientific numbers, which results in errors with bc

$ ./txfee-calc.sh $signedtx
(standard_in) 1: syntax error

$ echo "$btcin-$btcout_f"
8.859e-05-0.000088

# fixed by rewriting numbers with printf
$ echo $(printf '%.8f-%.8f' $btcin $btcout_f) | /usr/bin/bc
.00000059

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