golang大数字转换为可读/字符串格式

Question

I have a json response from an API that look like this after I use json. Unmarshal then save it to an interface variable.

 map[message_num:3 
 task_num:0 
 name: test_room 
 type:my role:member sticky:true unread_num:0 
 room_id:3.190762e+06 ]

I want to get the room_id, but its not readable

 3.190762e+06

I want to format this to a string, so I can use it to send a post request.

Answer 1

You could extract room_id from your JSON as a string "3.190762e+06".
Then you can:

• convert it to a (readable) float, with strconv.ParseFloat(),
• and convert it back to a string, with fmt.Sprintf().

See this example:

i, err := strconv.ParseFloat("3.190762e+06", 64)
if err == nil {
    s := fmt.Sprintf("%.0f
", i)
    fmt.Println(s)
} 

Output:

3190762