Use the fmt.Sprintf function to format a string into a specified format

Use the fmt.Sprintf function to format a string into a specified format

In the Go language, the fmt.Sprintf function is a very practical function that can format a string into a specified format. . It has a wide range of uses and can be used to build complex strings, including printing logs, generating error messages, etc.

Let's look at a simple example below. Suppose we have a structure of student information, including name, age and score. Now we need to format this information into a string so it can be printed.

First, we define a structure type to represent student information:

type Student struct {
    Name   string
    Age    int
    Score  float64
}

Next, we create a student object and assign a value:

student := Student{
    Name:   "小明",
    Age:    18,
    Score:  89.5,
}

Then, we use fmt The .Sprintf function formats student information into a string:

studentStr := fmt.Sprintf("姓名：%s，年龄：%d，分数：%.2f", student.Name, student.Age, student.Score)

In the above code, we use the placeholders %s, %d and %.2f, which represent strings, integers and floats respectively. Formatting of points.

Finally, we can print out the formatted student information:

fmt.Println(studentStr)

Run the above code, the output result is as follows:

姓名：小明，年龄：18，分数：89.50

In addition, fmt.Sprintf Functions can also be used to generate error messages. For example, when an error occurs while processing a file, we can use this function to format the relevant information into an error string and then return it to the caller.

In general, the fmt.Sprintf function is very practical in the Go language and can be used to format strings to achieve the output we want. Whether printing logs or generating error messages, it can help us simplify the code and improve readability.

I hope this article will help you understand the use of fmt.Sprintf function in Go language.

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