[Solved] how to print char in multiple times in c++

The easiest way is probably

#include <iostream>
#include<string>

using namespace std;

int main (){
   int a=2;
   while(a<=6){
       cout<< a << std::string((a/2),'*') <<endl;
                // ^^^^^^^^^^^^^^^^^^^^^^
       a+=2;
   }
   return 0;
}