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How do you check if a coupon code is correct using Formulas? Lets go into the builder. Here we have a Question: text block that asks the users for a coupon code. And the answer is saved in the string variable called @code. Here in the formulas block, as you can see we have all the different custom outputs of the variable resultcode. But no formula is written yet. Depending on the code, we will write a different message. With one of the codes you dont get anything, with the other, a free car, with this one a free trip to Las Vegas and if the coupon code typed in by the user does not match with any of the above we will send a message asking to retype it again. Not bad at all! So, inside the Formulas block, what we will do is write Upper() and the variable from the question text field, in this case @code. What this does is that it takes the users input from the Question text block and turns it into Uppercase. This is a reliability measure, with this
