create 0008-string-to-integer.go

go/0008-string-to-integer.go

@@ -0,0 +1,57 @@
+package stringtointeger
+
+import (
+ "math"
+ "strconv"
+)
+
+func myAtoi(s string) int {
+ sign := 1
+ sum := 0
+ plusFound := false
+ NumIntParsed := 0
+ for _, v := range s {
+ if s == "" {
+ return 0
+ }
+ if v >= '0' && v <= '9' {
+ NumIntParsed++
+ n, err := strconv.ParseInt(string(v), 10, 32)
+ if err == nil {
+ sum = sum*10 + int(n)
+ }
+ // Max and Min int values
+ if sum > math.MaxInt32 {
+ if sign < 0 {
+ return math.MinInt32
+ } else {
+ return math.MaxInt32
+ }
+ }
+ // check if there is at last one int is parsed
+ } else if sum >= 0 && NumIntParsed > 0 {
+ return sign * sum
+ } else {
+ //-------------- checking for edge case ---------------
+ // check for ++ and +- case
+ if plusFound || sign == -1 {
+ return 0
+ }
+ if v == '-' {
+ sign = -1
+ } else if v == '+' {
+ plusFound = true
+
+ } else if v == ' ' {
+ // to check for + serounded with spaces
+ if plusFound {
+ return 0
+ }
+ continue
+ } else {
+ break
+ }
+ }
+ }
+ return sign * sum
+}