Thread: vector<vector<const char*>> behaving strangely

Code:

#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main (int argc,char** argv){
    vector<vector<const char*>> b(3,vector<const char*>(3));
    for(int i=0;i<3;i++){
        for(int j=0;j<3;j++){
            b[i][j]=to_string(i*3+j).c_str();
        }
    }
    
    for(int i=0;i<3;i++){
        cout<<endl;
        for(int j=0;j<3;j++)cout<<b[i][j];
    }
    cout<<endl;
}

it return

Code:

888
888
888

whereas it should return

Code:

012
345
678

ps:i used -std=c++11;any help appreciated

What does the function to_string do?

std::to_string - cppreference.com just convert int to string

thanks for info.are thare anyone who has an idea to overcome it

ok.thanks