Click a button do this calculation then output value

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    I need to make a really simple calculation app to run in Windows from entering 3 numerical values in text boxes, clicking a button and outputting the result to a string.
    The app is for creatinine clearance, it's a measure of renal function.

    This is the Cockcroft-Gault formula:

    (140 - age) X weight / (0.82 X serum creatinine)

    The serum creatinine is derived from a blood test.

    So I enter age, weight, serum creatinine and then I click the button and I get the creatinine clearance. For example a weight of 68 kg, 140 minus 67 years of age and a serum creatinine of 133 mg/dL = 46 mL/min.

    How do I enter this formula as an expression? And do I use edit objects for the 3 value parameters and a string for the result?

    3 edit objects for the input values will work - the tricky part will probably be having to convert the inputs from a 'string' to a 'value' so that Fusion can properly interpret the values to do maths on them.

    Here's an example - typing in the values will automatically update the creatinine clearance:
    Please login to see this attachment.

    This will convert each input from a string to a value (no need to enter units, just the number), perform the calculation, and store the result in Global Value A.

    It then takes Global Value A and turns it into a string so that it can be displayed

    Also, I forgot the value is different for women. For women the creatine clearance result should be multiplied by 0.85. So a male's creatinine clearance of 46 would be 39 for a woman.
    How do I add this into the equation? Ideally from a radio button, one for male and one for female and can switch between them.

    Aaaaand, this is probably a bit more difficult. Not all labs give the creatinine value in umol/L. Some are in mg/dL. For example 133 umol is 1.5 mg/dL. It would be great to add another button that can switch between the two formulas. If entering the serum creatinine in mg/dL the formula changes to (140 - age) X weight / (72 X serum creatinine).

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