8. String to Integer (atoi).cpp

8. String to Integer (atoi).cpp

@@ -0,0 +1,38 @@
+class Solution {
+public:
+    int myAtoi(string s) {
+        int l = s.length();
+        int sign = 1, i = 0;
+        long long ans = 0;
+
+        // trimming leading spaces
+        while (i < l && s[i] == ' ') i++;
+
+
+        // sign check condition
+        if (i == l)
+            return 0;
+        if (s[i] == '-') {
+            sign = -1;
+            i++;
+        } else if (s[i] == '+')
+            i++;
+
+        // converting characters to integer
+        while (i < l && isdigit(s[i])) {
+            int digit = s[i] - '0';
+            ans = ans * 10 + digit;
+
+            // overflow condition handling
+            if (sign == 1 && ans > INT_MAX) {
+                return INT_MAX;
+            }
+            if (sign == -1 && (-1 * ans) < INT_MIN) {
+                return INT_MIN;
+            }
+            i++;
+        }
+
+        return (int)(ans * sign);
+    }
+};