arithmetic.g4 question

[Willy Andrianarisoa]

I try to implement formula builder project , i start as a scratch the arithmetic.g4 grammar available in antlr4 github (https://github.com/antlr/grammars-v4/blob/master/arithmetic/arithmetic.g4)

I start to test it , with some inputs,

When i try to analyze (with ANTLR input below

10 < 10G

it didn"treport any error ! 

Is this correct (10G is a bad input i suppose)?

I'm a little bit stucked with it. I t

I put in attachments ,  the grammar and the parsetree result

Thanks for any help

Will