Golang compilation error: "undefined: fmt.Scan" How to solve it?

In recent years, golang has been favored by developers due to its simplicity, ease of learning, efficiency and stability. However, when compiling with golang, developers may encounter various errors. One of the more common errors is "undefined: fmt.Scan". So, how to solve this error?

First of all, we need to understand the reason for this error. In golang, the fmt library is a very commonly used library, but in some cases, we need to import fmt manually, otherwise compilation errors such as "undefined: fmt.Scan" will occur. This situation usually occurs when we write a short and concise program that does not require the use of too many libraries, but due to the lack of import of the fmt library, the program cannot be compiled normally.

So, how to solve this problem? In fact, the solution is also very simple - we only need to manually import the fmt library at the beginning of the program file. The example is as follows:

package main

import "fmt"

func main() {
    var str string
    fmt.Scan(&str)
    fmt.Println(str)
}

By manually importing the fmt library, we can solve the problem of "undefined: fmt.Scan "This compilation error. However, we need to note that in actual programming, we should manually import the fmt library when we need to use it, rather than importing the entire library to avoid this error. This can reduce the resource usage of the program and improve the readability of the code. sex.

In addition to manually importing the fmt library, there is another way to solve this problem, which is to use ".../fmt" to import the specified function in the fmt library. The example is as follows:

package main

import (
    _ "fmt"
    _ "os"
    "bufio"
)

func main() {
    var str string
    reader := bufio.NewReader(os.Stdin)
    fmt.Fscan(reader, &str)
    fmt.Println(str)
}

In this example, we use the ".../fmt" method to import the Fscan function in the fmt library, avoiding the import of the entire fmt library, and also solving the "undefined: fmt.Scan" compilation error.

To sum up, for the "undefined: fmt.Scan" compilation error, we can solve it by manually importing the fmt library or using ".../fmt" to import the specified function. I hope this article can help golang developers who encounter this problem.

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