Implement your own Atoi function in Go (Golang)

Table of Contents

Overview

Atoi function converts a given string into its number representation. For eg

Input: "121"
Output: 121
Input: "-121"
Output: 121
Input: "0"
Output: 0

Program

Below is the program for the same.

package main
import (
"fmt"
"strconv"
)
func main() {
output := myAtoi("121")
fmt.Println(output)
output = myAtoi("-121")
fmt.Println(output)
output = myAtoi("0")
fmt.Println(output)
}
func myAtoi(s string) int {
var output int
sign := "positive"
if string(s[0]) == "-" {
sign = "negtive"
s = s[1:]
} else if string(s[0]) == "+" {
s = s[1:]
}
stringLen := len(s)
for i := 0; i < stringLen; i++ {
tempNum, _ := strconv.Atoi(string(s[i]))
output = output*10 + tempNum
}
if sign == "negtive" {
output = output * -1
}
return output
}

Output

121
-121
0

golang