diff --git a/007. String to Integer (atoi)/main.cpp b/007. String to Integer (atoi)/main.cpp
new file mode 100644
index 0000000..5bf89a3
--- /dev/null
+++ b/007. String to Integer (atoi)/main.cpp	
@@ -0,0 +1,13 @@
+#include <iostream>
+#include "solution.h"
+
+
+int main() {
+    string str;
+    cin>>str;
+    
+    Solution s;
+    std::cout << s.myAtoi(str) << std::endl;
+    
+	return 0;
+}
diff --git a/007. String to Integer (atoi)/solution.h b/007. String to Integer (atoi)/solution.h
new file mode 100644
index 0000000..8fd268b
--- /dev/null
+++ b/007. String to Integer (atoi)/solution.h	
@@ -0,0 +1,35 @@
+class Solution {
+public:
+    int myAtoi(string A) {
+        long long int temp=0, ans=0;
+    
+        int i=0;
+        bool neg=0;
+        
+        while(A[i]==' ') i++;
+        if(i==A.size()) return 0;
+
+        if(A[i]=='-'){
+            i++;
+            neg=1;
+        } else if(A[i]=='+') i++;
+
+        for(;i<A.size();i++){
+            if(A[i]<'0' || A[i]>'9') break;
+
+            temp = A[i]-'0';
+
+            ans = ans*10 + temp;
+            
+            if(neg && ans>INT_MAX) return INT_MIN;
+            
+            if(!neg && ans>=INT_MAX) break;
+        }
+
+        if(neg){
+                return -ans;
+        }
+        if(ans>=INT_MAX) return INT_MAX;
+        return ans;
+    }
+};
\ No newline at end of file