在golang中将子字符串转换为int

Question

I have this variable:

danumber := "542353242"

and want to extract a character from the string and operate with it as a number. Tried this:

int(danumber[0])

but it doesn't seem to work.

Answer 1

What your expression gives you is the character code for the digit. To convert the character to the character's value, subtract 0's character code from it:

int(danumber[0] - '0') // in your example, this is: 53 - 48

If you want to convert multiple digits, I would recommend using the strconv package:

number, err := strconv.Atoi(danumber[0:2]) // convert first two characters to int