lc.2

1. to_string converting int to string

#include <string> //remember to include the <string> headfile!
using namespace std;

string s = to_string(42);

#stoi convert string to int

stoi( str )

1. MY MISUNDERSTANDINGS
   ```cpp
   string str=to_string(x);//convert x to a string
   int result =0;
   int muti =1;//倍数

for(int i=0;i<str.length();i++){
result =result + str[i]muti;
muti=muti10;
}

---
```cpp
         string str=to_string(x);//convert x to a string

         string result;

         for(int i=str.length()-1;i>=0;i--){

            result+=str[i];//let the result be a string,too

         }

---

2024-07-27 02:32