Introduction to Scan function in go language

Variants: Scan, Scanln, Scanf,Sscanf

In Go language, to read data from standard input (keyboard by default), you can use the Scan and Scanln functions in the fmt package.

• Scan(): Note that &numif the input data format is incorrect, an error will be returned.

  var num int
  fmt.Scan(&num)
  

• Scanln(): Similar to Scan, but only reads one line of data (treats a newline as a termination)

  var name string
  fmt.Scanln(&name)
  

• Scanf(): Parse the input according to the specified format. The example program reads an integer and a string from standard input and stores them in the variables num and name respectively:

  var num int
  var name string
  fmt.Scanf("%d %s", &num, &name)
  

• Sscanf(): String scan, read data from a string. Sscanf works like Scanf, except it reads from a string instead of standard input.

   var num int
   var name string
   fmt.Sscanf("10 foo", "%d %s", &num, &name)
  

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Note : Do not confuse the usage of various input methods

fmt.Scan("%d", &num)	// 错误的写法
fmt.Scan(&num)				// 正确

The first kind of error, which uses to Scanget input, but uses Scanfthe wording of .