double-precision floating-point numbers?

[willia23]

I know that there are floating numbers in c++ but want to know if there is double-precision floating-point numbers? Why do I ask? Because I learned lua before c++ and that is the automatic number type and lua runs really well for me :).

[Bazzy]

|Precision:_|_Declaration:____|_Numeric Example:_|
|__single__|___float______|____123.456f_____|
|_ double__|__double______|____123.456______|

[willia23]

Thanks for the help. What do u add the begging of the variable?