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1, A simple for Circular case ：1-100 The sum of the

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2, Omit the application of initial conditions ：10 Turn into the system 2 Base number

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3, Omit the application of incremental conditions ： Read abc.txt Output the contents in the file ,go No, while, It can be used for replace

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4,for Application of loop omitting end condition ： Dead cycle

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1, A simple for Circular case ：1-100 The sum of the

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package main
import "fmt"
// Loop statement for
//for We don't need brackets in the condition 
//for The initial condition can be omitted from the condition of , The end condition , Incremental expression 
func main() {
	sum := 0// Definition sum The initial value is 0
	for i := 1; i <= 100; i++ {//i from 1 To 100, In steps of 1
		sum += i// Add once per cycle 
	}
	fmt.Println(sum)
}

Output ：5050

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2, Omit the application of initial conditions ：10 Turn into the system 2 Base number

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func tobin(n int) string { // Integer to binary function , The value of the function is an integer , The return value of the function is a string 
	result := ""
	for ; n > 0; n /= 2 {
		lsb := n % 2
		result = strconv.Itoa(lsb) + result //itoa The function is to convert the integer into characters 
	}
	return result
}

Output ：101 1101

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3, Omit the application of incremental conditions ： Read abc.txt Output the contents in the file ,go No, while, It can be used for replace

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// Omit the application of incremental conditions ,go No, while, It can be used for replace 
func printfile(filename string) {
	file, err := os.Open(filename) // Use os.open Open a file , Two parameters are returned 
	//file It's a document ,err Is the error message 
	if err != nil { // If err It's not equal to nil Description error 
		panic(err) // Use panic Function to terminate the program and report an error 
	}
	scanner := bufio.NewScanner(file) // Definition scanner For reading content 
	for scanner.Scan() {              //for The loop omits the increment condition and has only one end condition 
		fmt.Println(scanner.Text()) // Output the contents of the file line by line 
	}
}

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4,for Application of loop omitting end condition ： Dead cycle

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//for Application of loop omitting end condition 
func forever() {
	for {
		fmt.Println("abc")
	}
}

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package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

// Omit the application of initial conditions ：10 Turn into the system 2 Base number 
func tobin(n int) string { // Integer to binary function , The value of the function is an integer , The return value of the function is a string 
	result := ""
	for ; n > 0; n /= 2 {
		lsb := n % 2
		result = strconv.Itoa(lsb) + result //itoa The function is to convert the integer into characters 
	}
	return result
}

// Omit the application of incremental conditions ,go No, while, It can be used for replace 
func printfile(filename string) {
	file, err := os.Open(filename) // Use os.open Open a file , Two parameters are returned 
	//file It's a document ,err Is the error message 
	if err != nil { // If err It's not equal to nil Description error 
		panic(err) // Use panic Function to terminate the program and report an error 
	}
	scanner := bufio.NewScanner(file) // Definition scanner For reading content 
	for scanner.Scan() {              //for The loop omits the increment condition and has only one end condition 
		fmt.Println(scanner.Text()) // Output the contents of the file line by line 
	}
}

//for Application of loop omitting end condition 
func forever() {
	for {
		fmt.Println("abc")
	}
}
func main() {
	fmt.Println(
		tobin(5),  //101
		tobin(13), //1101
	)
	printfile("abc.txt")
	forever()
}