c++ - Can std::cout print "NULL" instead of 0 when printing a null pointer?

Question

Can std::cout print "NULL" instead of 0 when printing a null pointer?? I can write a simple if statement like

if(pointer == nullptr)
  std::cout << "NULL";

But can I get the same result without using an if statement?

标签： c++pointers

Answer 1

使用 if 语句无法真正逃脱，但可以使用三元运算符将其变成单线： (p == NULL ? std::cout << "NULL" : std::cout << p);

#include <iostream>

int main() {
  void *p = NULL;
  (p == NULL ? std::cout << "NULL" : std::cout << p);
  std::cout << std::endl;

  p = new int;
  (p == NULL ? std::cout << "NULL" : std::cout << p);
  std::cout << std::endl;
}

演示