string-to-integer-atoi

string-to-integer-atoi/sol.go

@@ -0,0 +1,29 @@
+package main
+
+var MIN, MAX = -(1 << 31), (1 << 31) - 1
+
+func myAtoi(s string) int {
+	m, n, c := 1, true, 0
+	for _, char := range s {
+		if n && char == ' ' {
+			continue
+		} else if n && char == '-' {
+			m = -1
+		} else if !(n && char == '+') {
+			char_n := int(char - '0')
+			if char_n < 0 || char_n > 9 {
+				break
+			}
+			c *= 10
+			c += char_n
+			if c < 0 || c > MAX {
+				if m == 1 {
+					return MAX
+				}
+				return MIN
+			}
+		}
+		n = false
+	}
+	return c * m
+}