Merge pull request #911 from AkshatAggarwal14/Issue#906

8. | String to Integer (atoi) | C++
noisefilter19 · Oct 1, 2021 · 57d30bf · 57d30bf
2 parents c64ec6d + 7bf149c
commit 57d30bf
Showing 1 changed file with 24 additions and 0 deletions.
diff --git a/C++/String_to_integer_atoi.cpp b/C++/String_to_integer_atoi.cpp
@@ -0,0 +1,24 @@
+// https://leetcode.com/problems/string-to-integer-atoi/
+class Solution {
+   public:
+    int myAtoi(string str) {
+        int sign = 1, i = 0;
+        while (str[i] == ' ') i++;
+        if (str[i] == '-' || str[i] == '+') sign = 1 - 2 * (str[i] == '-'), i++;
+        long long int base = 0;
+        while (str[i] >= '0' && str[i] <= '9') {
+            base = 10 * base + (str[i++] - '0');
+            if (base > INT_MAX) {
+                if (sign == -1) return INT_MIN;
+                return INT_MAX;
+            }
+        }
+        if (base > INT_MAX) {
+            if (sign == -1)
+                return INT_MIN;
+            else
+                return INT_MAX;
+        }
+        return (int)base * sign;
+    }
+};