string to integer

Author: shariarfaisal

8.string-to-integer-atoi.go

@@ -0,0 +1,49 @@
+package leetcode
+
+import (
+	"strings"
+)
+
+/*
+ * @lc app=leetcode id=8 lang=golang
+ *
+ * [8] String to Integer (atoi)
+ */
+
+// @lc code=start
+func myAtoi(s string) int {
+	s = strings.TrimSpace(s)
+	if len(s) == 0 {
+		return 0
+	}
+	var sign int
+	if s[0] == '-' {
+		sign = -1
+		s = s[1:]
+	} else if s[0] == '+' {
+		sign = 1
+		s = s[1:]
+	} else {
+		sign = 1
+	}
+	var res int
+	for i := 0; i < len(s); i++ {
+		if s[i] < '0' || s[i] > '9' {
+			break
+		}
+		res = res*10 + int(s[i]-'0')
+		if res > 2147483647 {
+			break
+		}
+	}
+	res = res * sign
+	if res > 2147483647 {
+		return 2147483647
+	}
+	if res < -2147483648 {
+		return -2147483648
+	}
+	return res
+}
+
+// @lc code=end