new snippet - string to int

Author: Emosans

snippets/cpp/string-manipulation/string-int.md

@@ -0,0 +1,20 @@
+---
+title: String Int
+description: Converts string to int without built in stoi()
+author: Emosans
+tags: string,int
+---
+
+```cpp
+std::int to_num(const std::string& input){
+    int num=0;
+    int len=input.size();
+    for(int i=0;i<len;i++){
+        num=num*10+(input[i]-'0');
+    }
+    return num;
+}
+
+// Usage
+to_num("123"); // Returns 123(type->int)
+```