Problems encountered by scan, scanf and scanln in golang

Problem description ：

func main(){
    
	var input byte
	fmt.Println(" Please enter a letter ")
	scan, err := fmt.Scan(&input)
	if err != nil {
    
		fmt.Println("err:", err)
	}
	fmt.Println(scan)
	fmt.Printf("the anser is %c", input)
}

This defines a variable to accept byte But I can't accept , The errors that occur are as follows

 Please enter a letter 
a
err: expected integer
0
the anser is 

Expect to accept integers , This is because byte The essence of type is uint8 Type of , So you should pass in an integer , But you still need to pass in the character type have access to scanf Conduct , The code is as follows .

func main(){
    
	var input byte
	fmt.Println(" Please enter a letter ")
	_, err := fmt.Scanf("%c", &input)
	if err != nil {
    
		fmt.Println("err:", err)
	}
	fmt.Printf("the anser is %c", input)

}

The specific output is

 Please enter a letter 
a
the anser is a
Process finished with exit code 0

problem 2:

func main(){
    
	var input byte
	fmt.Println(" Please enter a letter ")
	fmt.Scanf("input: %c", &input)
	fmt.Println(input)
	switch input {
    
	case 'a':
		fmt.Println(" Today is Monday ")
		fmt.Println(" It's time to go to school ")
	case 'b':
		fmt.Println(" Today is Tuesday ")
	case 'c':
		fmt.Println(" Today is Wednesday ")
	default:
		fmt.Println(" Today is the weekend ")
	}
}

The terminal should also follow scanf Write the style of the first parameter in , Just replace the placeholder with something you need .

 Please enter a letter 
input: a

It needs to be written in this way to be recognized as a