99bottles.cpp

Your for loop should have a counter that starts at 99:

#include <iostream>

int main() {

  // Write a for loop here:

  for (int i = 99; i > 0; i--) {

    std::cout << i << " bottles of pop on the wall.\n";
    std::cout << "Take one down and pass it around.\n";
    std::cout << i - 1 << " bottles of pop on the wall.\n\n";

  }

}
If you want to add the final verse at the end:

#include <iostream>

int main() {

  // Write a for loop here:

  for (int i = 99; i > 0; i--) {

    std::cout << i << " bottles of pop on the wall.\n";
    std::cout << "Take one down and pass it around.\n";
    std::cout << i - 1 << " bottles of pop on the wall.\n\n";

  }

  std::cout << "No more bottles of pop on the wall.\n";
  std::cout << "No more bottles of pop.\n";
  std::cout << "Go to the store and buy some more,\n";
  std::cout << "99 bottles of pop on the wall.\n";

}