使fmt.sprintf不替换变量中的％s

Question

If I wanted to do the following:

    a := "%shello%s"
    b:= fmt.Sprintf("%sWorld",a)
    fmt.Printf(b)

I want to print

 %shello%sWorld

ie %s is replaced only in %sWorld.

How can i do that?

I do not want to replace a with %%shello%%s

Answer 1

a := "%shello%s"
b:= fmt.Sprintf("%sWorld",a)

This works just fine, it results in a string being "%shello%sWorld".

The problem is with how you print it:

fmt.Printf(b)

fmt.Printf() treats b as a format string, and since b's value contains %s, this expects you to also pass arguments (which you haven't), so the actual output contains error messages.

Instead print it with fmt.Println():

fmt.Println(b)

And output will be (try it on the Go Playground):

%shello%sWorld