How to make the user select from a list of inputs for a particular input ?

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Normally if we include a string input, one can enter any string.

But i want to restrict to choose from a list of 3 strings just like in a combo box. 

[Alain Verleyen]

chandra100:

Normally if we include a string input, one can enter any string.

But i want to restrict to choose from a list of 3 strings just like in a combo box. 

Use an ENUM.

[Simon Gniadkowski]

chandra100:

Normally if we include a string input, one can enter any string.

But i want to restrict to choose from a list of 3 strings just like in a combo box. 

Something like this . . .

input ENUM_MA_METHOD MA_Method=MODE_SMMA;

from here: https://www.mql5.com/en/docs/basis/variables/inputvariables

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angevoyageur:
Use an ENUM.

Thanks. i think it will work for user created ENUMS too.