Can anyone help me?Calculadora_copy (1).aia (64.4 KB)
Welcome. It is better to show the relevant blocks of your project so that we can help you.
try to understand the error message…
you are using the multiply block, your first argument is 5 and the second is empty string
to be able to multiplicate, you should use 2 numeric values… an empty string will not work…
Your global b variable remains empty when you click equals while performing multiplication that’s why this error is getting.
before doing the calculation you have to check, if the data a and b is valid for example like this
if is empty a then display a message "please enter a value for a" elseif is empty b then display a message "please enter a value for b" else do the calculation
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