Implementation of Single-choice buttons in MFC

Follow these two steps:
 
1) Find the button with the smallest index.
 
2) set its group attribute to TRUE.
 
At this time, all the single-choice buttons are a group.
 
For example, if there are five single-choice buttons whose index may be 1, 5, 6, 7, or 8, set the group attribute of the button whose index is 1 to TRUE.
 
If there are five buttons, you need to divide them into two groups: the first three, the first three, and the last two.
 
Set the group attribute of 1 to true, and then set group of 7 to true.
 
Each rule is followed by a group before the group with the next serial number.