number-parsing.go

package main

import (
	"fmt"
	"strconv"
)

/*
Parsing numbers from strings is a basic but common task in many programs;
here’s how to do it in Go.
*/

// NumberParse function illustrate how to parse number fom string in go.
func NumberParse() {

	// The built-in package strconv provides the number parsing.
	// With ParseFloat, this 64 tells how many bits of precision to parse.
	f, _ := strconv.ParseFloat("1.123", 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)
}