You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.go
    path of file: ./repos/learning/golang/source_code/Go语言核心编程代码/chapter06/fundemo01/main
    
    the code of the file until where you have to start completion: package main
import (
	"fmt"
	"go_code/chapter06/fundemo01/utils"
)


func main() {

	fmt.Println("utils.go Num~=", utils.Num1)
	//请大家完成这样一个需求:
	//输入两个数,再输入一个运算符(+,-,*,/)，得到结果.。
	//分析思路....
	var n1 float64 = 1.2
	var n2 float64 = 
    
func main() {

	fmt.Println("utils.go Num~=", utils.Num1)
	//请大家完成这样一个需求:
	//输入两个数,再输入一个运算符(+,-,*,/)，得到结果.。
	//分析思路....
	var n1 float64 = 1.2
	var n2 float64 = 2.3
	var operator byte = '+'
	result := utils.Cal(n1, n2 , operator) 
	fmt.Println("result~=", result)


	//代码...
	//代码...
	//代码...

	//有需求，输入两个数num1, num2，计算 + / *  - 的值

	n1 = 4.5
	n2 = 6.7
	operator = '*'
	result = utils.Cal(n1, n2 , operator)
	fmt.Printf("result~=%.2f", result)
	// //..需求


}