Question

a program to display 3 variables of different data types

Answer 1

This is an example I created 5 min ago. Since you didn't specify how you want to display the data, I made two commandline outputs.

#include <iostream>
#include <string>

using namespace std;

int
main ()
{
  int value_int = 6;
  float value_flo = 0.35;

  char value_cha = 'B';
  string value_str = "Es ist nämlich Brotzeit.";

  cout << "iostream:\tIch möchte " << value_int << " " << value_cha <<
    "rote für jeweils " << value_flo << " cent. " << value_str << endl;

  printf ("printf:\t\tIch möchte %i %crote für jeweils %0.2f cent. %s",
      value_int, value_cha, value_flo, value_str.c_str());

  return 0;
}

Greetings