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Improve is_float to accept standard form notation

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This commit is contained in:
Gregory Chamberlain 2020-09-23 23:58:42 +01:00
parent 2d2d96f63b
commit 83a8538479
1 changed files with 5 additions and 4 deletions
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@ -894,10 +894,11 @@ var=$((var2 > var ? var2 : var))
is_float() {
# Usage: is_float "number"
# The test checks to see that the input contains
# a '.'. This filters out whole numbers.
[ -z "${1##*.*}" ] &&
printf %f "$1" >/dev/null 2>&1
# Printing as '%d' must fail in order to filter out whole numbers;
# then printing as '%f' will succeed if and only if '$1' is a float.
# This works for both decimal point form (i.g. 3.14) and standard form
# (e.g. 314e-2).
{ ! printf %d "$1" && printf %f "$1" ; } >/dev/null 2>&1
}
```