```{index} single: isfloat (Scalar::Util::Numeric) ``` ```{index} single: Scalar::Util::Numeric::isfloat ``` # isfloat Whether a value is a number with a fraction or an exponent. ## Synopsis ```perl use Scalar::Util::Numeric qw(isfloat); isfloat("1.0"); # 1 isfloat("1e3"); # 1 isfloat(10); # 0 ``` ## What you get back 1 when the number is written with a decimal point or an exponent, or is infinity or NaN, else 0.