Could you help me,please?

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MFC

I have to write program using mfc in c++ vb.net8 to convert degree from
Three temperature scales are in common use in science and industry:
• The degree Celsius (°C) scale
• The Kelvin (K) scale
• The degree Fahrenheit (°F) scale

I wrote program to draw the scrollbar to enter the degree after that chose the radiobutton. but i don't know how can i connect all of them each other.
can you give code t=for this issue

thank you