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C++ 交換數字不新增變數

#include <iostream>
using namespace std;
int main(int argc, char const *argv[])
{
  int a, b;
  // cin >> a >> b;
  a = 5;
  b = 9;

  a = a+b; // 14 9
  b = a-b; // 14 5
  a = a-b;
  cout << "1: " << a << endl << "2: " << b;
  return 0;
}