You can calculate expressions and see the outcome (value and data type) on the console directly. The simple syntax consists of an equal sign (=) followed by the expression.
>> a[] = 5
>> = a[]* (3 + 5)
24 [plain numeral]
>> = average( 1,2,3,4 )
2.5 [plain numeral]
>> table load ( t, 'Examples\Cities.csv' )
>> = [t: City, Boston, 'State/Province' ]
Massachusetts [quoted string]
>> exit // Leave B4P