1. If want to reuse the same stringstream object, need to clear the buffer before use.
stream.clear() works in Dev-C++.
Others recommended stream.str(""), but it doesn't work in my code.
2. int: 10, 100, 1000, 10000...
After being converted to string type and reversed, they'll be 01, 001, 0001, 00001... Convert them back to int, will get just 1, no more zeros.
3. reverse int : 1000000003 can cause overflow problem.
So use long long type to save 3000000001. Problem solved.
4. Assignment: string = int will assign the ACSii code of the int to string. e.g.:
int i = 49; string s = i; cout << s;
Output: 1
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My test code:
#include<iostream>
#include<string>
#include<sstream>
#include<algorithm>
using namespace std;
int main(){
int i = 1000000003;
string s;
stringstream ss;
s = i;
cout << i << " " << s << endl;
// int to string
ss << i;
ss >> s;
cout << i << " " << s << endl;
// reverse string
reverse(s.begin(), s.end());
cout << sizeof(s) << " This is a string " << s << endl;
// string to in
long long result;
ss.clear();
ss << s;
ss >> result;
cout << sizeof(result) << " This is a int " << result << endl;
return 0;
}