os. When the command line parameter in args[1:] is empty, the internal statement will not be executed

Problem description

When the value entered on the command line is null , Not execute else Statement block after .

func qualityTran() {
    
	for _,v := range os.Args[1:]{
    
		// If it's not empty , Direct conversion to original value 
		if v !=""{
    
			a,_ := strconv.Atoi(v)
			fmt.Println(tran(a))
			//input.Scan()
		}else {
    
			fmt.Println("1")
			// If it is empty, it is read from the standard input 
			fmt.Println("please input a num:")
			input := bufio.NewScanner(os.Stdin)
			input.Scan()
			a :=input.Text()
			b,_ := strconv.Atoi(a)
			fmt.Println(tran(b))
		}
	}
}

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Cause analysis ：

During the actual program execution ,for The cycle ends directly , Will not enter if Sentence judgment .

---

Solution ：

func qualityTran() {
    
	flag :=0
	for _,v := range os.Args[1:]{
    
		// If it's not empty , Direct conversion to original value 
		if v !=""{
    
			a,_ := strconv.Atoi(v)
			fmt.Println(tran(a))
			//input.Scan()
			flag =1
		}
	}
	if flag ==0 {
    
		// If it is empty, it is read from the standard input 
		fmt.Println("please input a num:")
		input := bufio.NewScanner(os.Stdin)
		input.Scan()
		a :=input.Text()
		b,_ := strconv.Atoi(a)
		fmt.Println(tran(b))
	}
}