I have specific questions for my project
input = "3d6"
I want to convert this string some parts to integer. For instance I want to use input[0] like integer. How can I do this?
3
-
2i, err := strconv.Atoi(input[:1])user5728991– user57289912018-06-27 23:49:41 +00:00Commented Jun 27, 2018 at 23:49
-
Go doesn't have type casting. You're also not talking about typecasting at all. You're talking about type conversion and string parsing.Jonathan Hall– Jonathan Hall2018-06-28 10:43:35 +00:00Commented Jun 28, 2018 at 10:43
-
More important: What have you tried, and what problems did you encounter? Show your code.Jonathan Hall– Jonathan Hall2018-06-28 10:43:54 +00:00Commented Jun 28, 2018 at 10:43
Add a comment
|
1 Answer
There's two problems here:
How to convert a string to an integer
The most straightforward method is the Atoi (ASCII to integer) function in the strconv package., which will take a string of numeric characters and coerce them into an integer for you.
How to extract meaningful components of a known string pattern
In order to use strconv.Atoi, we need the numeric characters of the input by themselves. There's lots of ways to slice and dice a string.
You can just grab the first and last characters directly -
input[:1]andinput[2:]are the ticket.You could split the string into two strings on the character "d". Look at the
splitmethod, a member of thestringspackage.For more complex problems in this space, regular expressions are used. They're a way to define a pattern the computer can look for. For example, the regular expression
^x(\d+)$will match on any string that starts with the characterxand is followed by one or more numeric characters. It will provide direct access to the numeric characters it found by themselves.- Go has first class support for regular expressions via its
regexppackage.
- Go has first class support for regular expressions via its
