exectime.go

package main

import (
	"fmt"
	"time"
)

func main() {
	start := time.Now()
	time.Sleep(time.Second)
	duration := time.Since(start)
	fmt.Println("It took time.Sleep(1)", duration, "to finish.")
	start = time.Now()
	time.Sleep(2 * time.Second)
	duration = time.Since(start)
	fmt.Println("It took time.Sleep(2)", duration, "to finish.")
	start = time.Now()
	for i := 0; i < 200000000; i++ {
		_ = i
	}
	duration = time.Since(start)
	fmt.Println("It took the for loop", duration, "to finish.")
	sum := 0
	start = time.Now()
	for i := 0; i < 200000000; i++ {
		sum += i
	}
	duration = time.Since(start)
	fmt.Println("It took the for loop", duration, "to finish.")
}