[bash] echo-ing integers with more than 63 bits | Exercism | Page 1

somber cairn Sep 27, 2023, 1:30 PM

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Since bash overflows after 2^63-1 I have done quite a bit of research already and many people on StackOverflow have advised others to use the command bc in the form of var=$( bc <<< "$number" ) however, this doesn't seem to work in the output. It works fine for integers up to 62 bits but it still overflows when I echo "$var". I am using the online IDE from exercism. Is there any other way around this?

jaunty shadow Sep 27, 2023, 2:01 PM

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printf can help for another bit by forcing it to an unsigned int, eg for Grains

gaunt locust Sep 27, 2023, 2:15 PM

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At a bash prompt, enter help printf, man 1 printf and man 3 printf

jaunty shadow Sep 27, 2023, 2:22 PM

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Note help printf and man printf document different (though similar) commands. You want the former command.

#[bash] echo-ing integers with more than 63 bits