How do I do maths with variables?

MIT App Inventor Help
1

A error pops when i try to compute the + or * of two .get global variables
(cannot * " " and " ")

i am new this platform is there any way to tackle this situation

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2

Please show the actual error message

3

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4

Set your balance and gamble_amount variables to 0 (zero), they cannot be empty/blank

5

Also, do your randomization in run time events, not in global inits.

7

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is this the right way to do it

8

i am sorry , can you elaborate . which statement you are referring to here.

9

Safer to do it this way:

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10

the .initialize will run once during the startup right? or is it other way around

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thanks this is better.