math.ldexp

Compute a floating point number from the given mantissa and exponent. This is the inverse operation of math.frexp, and computes ${\displaystyle 2{\text{mantissa}}^{\text{exponent}}}$.

ExampleTurn user input into a number
Read a two lines from the user, and compute the floating point number represented by the given mantissa and exponent.
Code	<nowiki> local m = tonumber(read()) local e = tonumber(read()) print(math.ldexp(m, e)) </nowiki>
Output	Depends on what the user wrote. For instance, if they were to enter 0.625 and 3, the number print would be 5

math.ldexp Function
Syntax math.ldexp( mantissa : number exponent : number )
Returns	number
API	math
Source	Lua (source)