In C++. Correctly overload the function call operator()(int i, int j) for the Trans class of the following program to return the string concatenation of all vector entries in positions i through j and provide a main function that demonstrates the correctness of the overloaded operator.

#include #include #include "trans.h" using namespace std;

int main(int argc, char** argv) { Trans trans; cout << "seven :" << trans["seven"] << endl; cout << "three :" << trans["three"] << endl; return 0; }