Convert substring to int in golang

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.

What is the expected result of this supposed operation? 5 or 53 (an US-ASCII code for the character "5")? I'm asking because "extract a character ... and operate with it as a number" can be interpreted as if you'd like to get the character code and not convert "5" to an integer 5. — kostix
– kostix, Commented Jan 22, 2016 at 18:13

score 4 · Accepted Answer · 2016-01-22 18:07:50Z

4

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

edited Jan 22, 2016 at 18:07

answered Jan 22, 2016 at 17:58

user142162

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2 Comments

Sebastian Breit Over a year ago

thanx, I'll try it. Could you explain why would this work? What about a sub string like danumber[0:3] ?

user142162 Over a year ago

@Perroloco: Updated. Yes, danumber[0:3] would work as well with strconv.Atoi.

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