package main

import (
	"time"
	"fmt"
)

func main() {
	// map[KeyType]ValueType  集合类型
	var personSalary map[string]int
	// go的三个引用类型 map slice chan
	if personSalary == nil {
		fmt.Println("map is nil. Going to make one.")
		personSalary = make(map[string]int)
		fmt.Printf(format string, a ...interface{})
		time.Microsecond
		fmt.Printf(format string, a ...interface{})
		fmt.Print(a ...interface{})
		time.Millisecond();
		fmt.Print(a)
		fmt.Println(a)
		fmt.Printf(format, a)
	}
}