Answer to Question #8745 in Visual Basic for wilfred

Question #8745
Caffeine absorption.after caffeine is absorbed into the body 13% is eliminated from the body each hour.assume a person drinks an 8 Oz cup of brewed coffee containing 130mg of caffeine,and the caffeine is absorbed immediately into the body.Write a program to compute the following values.the number of hours required until 65mg(one-half the orginal amount remain in the body.the amount of caffeine in the body 24hours after the person drinks the coffee looking for the code
Just make the form in any VB version with 1 button, and add corresponding code.

The answer is 5 hours and 4mg.

Just in case, about 0,87:
(X*100%-X*13%)/100%=x*87%/100%=X*0,87

So to remove 13% we just multiply by 0,87

Public Class Form1

Dim caff_dose As Integer 'to count current dose
Dim hour As Integer 'to count hours
Dim caff_half_dose_time As Integer 'to hold found 1 question value
Dim hour24_left As Integer 'to hold found 2 question value

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

'initial values
caff_dose = 130
hour = 0

While caff_dose > 65 'the loop will end when the dose would fall below 65
hour = hour + 1 'increasing hours
caff_dose = caff_dose * 0.87 'decreasing dose
MsgBox("HALF DOSE TIME: on hour " & hour quot; we have " & caff_dose quot;mg") 'you can remove this line, just to show loop output
caff_half_dose_time = hour 'so when the loop stops we will have desired number
End While

'initial values again
caff_dose = 130
hour = 0

While hour < 24 'the loop will end on 24-th hour
hour = hour + 1 'same as above loop
caff_dose = caff_dose * 0.87 'same as above loop
MsgBox("24 HOURS: on hour " & hour quot; we have " & caff_dose quot;mg") 'you can remove this line, just to show loop output
hour24_left = caff_dose 'so we have the second value
End While

MsgBox("The number of hours required until 65mg amount remain in the body is " & caff_half_dose_time)
MsgBox("The amount of caffeine in the body 24hours after the person drinks the coffee is " & hour24_left)
End Sub
End Class

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