Use the comma operator (§ 4.10, p. 157) to rewrite the while loop from § 1.4.1 (p. 11) so that it no longer requires a block

#include <iostream>

int main() {
  int sum = 0, val = 1;
  //while (val <= 10 && (sum += val++)) ;  // null statement
  while (val <= 10 && (sum += val, ++val)) ;  // null statement
  std::cout << "Sum of 1 to 10 inclusive is " << sum << std::endl;

  // I think this rewrite diminishes the readability of the code.

  return 0;
}