Putting a set of real numbers in an array

Hi,
I am using Mervis for PLC programming in ST.
How can I put a set of real numbers in an array?Then how can I use the elements of this array individually in my ST program?

@HPC
The definition of the programming is in the IEC611313:VAR all_reals : ARRAY[0..20] OF real; tmp: real; END_VAR tmp := all_reals[5];

@MartinKudláček Thank you.