Go by Example: Number Parsing

Go by Example : Number Parsing

Parsing numbers from strings is a basic but common task in many programs; here’s how to do it in Go.
	`package main`
The built-in package `strconv`provides the number parsing.	`import ( "fmt" "strconv" )`
	`func main() {`
With `ParseFloat`, this `64`tells how many bits of precision to parse.	`f, _ := strconv.ParseFloat("1.234", 64) fmt.Println(f)`
For `ParseInt`, the `0`means infer the base from the string. `64`requires that the result fit in 64 bits.	`i, _ := strconv.ParseInt("123", 0, 64) fmt.Println(i)`
`ParseInt`will recognize hex-formatted numbers.	`d, _ := strconv.ParseInt("0x1c8", 0, 64) fmt.Println(d)`
A `ParseUint`is also available.	`u, _ := strconv.ParseUint("789", 0, 64) fmt.Println(u)`
`Atoi`is a convenience function for basic base-10 `int`parsing.	`k, _ := strconv.Atoi("135") fmt.Println(k)`
Parse functions return an error on bad input.	`_, e := strconv.Atoi("wat") fmt.Println(e) }`

	`$ go run number-parsing.go 1.234 123 456 789 135 strconv.ParseInt: parsing "wat": invalid syntax`
Next we’ll look at another common parsing task: URLs.

Next example: URL Parsing .