diff --git a/src/stringToInt.py b/src/stringToInt.py
index f5dbef9..b053202 100644
--- a/src/stringToInt.py
+++ b/src/stringToInt.py
@@ -1,3 +1,11 @@
 # return the int representation of string s
 def stringToInt(s):
-	pass
\ No newline at end of file
+	result = 0
+	power = 1
+	sign = 1 - 2*('-' == s[0])
+	if sign == -1:
+		s = s[1:]
+	for c in reversed(s):
+		result += (ord(c)-ord('0'))*power
+		power *= 10
+	return result*sign