I am working through Caleb Doxsey's Go book and I have two questions about fmt.Scanf
http://www.golang-book.com/4
I am wondering why the program does not stop after the second Scanf and wait for user input? And how do I test if the user entered an integer and/or did not leave blank?
package main
import (
"fmt"
//"math"
)
// compute square roots by using Newton's method
func main() {
var x float64 //number to take square root
var y float64 //this is the guess
var q float64 //this is the quotient
var a float64 //this is the average
// how do check if the user entered a number
fmt.Print("Enter a number to take its square root: ")
var inputSquare float64
fmt.Scanf("%f", &inputSquare)
// why doesn't program stop after
// the Print statement and wait
// for user input?
fmt.Print("Enter first guess ")
var inputGuess float64
fmt.Scanf("%f", &inputGuess)
//x = 2
x = inputSquare
y = inputGuess
for i := 0; i < 10; i++ { //set up the for loop for iterations
q = x/y //compute the quotient; x and y are given
a = (q + y) / x //compute the average
y = a //set the guess to the average
} //for the next loop
fmt.Println("y --> ", y)
//fmt.Println("Sqrt(2)", math.Sqrt(2))
}