using the fmt.scan function, read a value from the stdin into the v variable, and finally output its value. in go

To read a value from stdin into a variable and output its value in Go, you can use the fmt.Scan function. Here's an example:

main.go
package main

import "fmt"

func main() {
    var v int
    fmt.Println("Enter a number:")
    _, err := fmt.Scan(&v)
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    fmt.Println("You entered:", v)
}
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In the above code, we define a variable v of type int to store the user input. We then prompt the user to enter a number using the fmt.Println function. The fmt.Scan function is then used to read the input from stdin into the variable v. The fmt.Scan function returns two values: the number of items successfully scanned and any error that occurred. We ignore the first value using the blank identifier (_) and handle the error if it occurs. Finally, we print the value of v using the fmt.Println function.

Note that the fmt.Scan function can be used to read values of different types by providing a pointer to the variable you want to store the input in. In this example, we used &v to pass a pointer to the v variable.

You can run this code and test it by providing an input number when prompted and observing the output.