C++ 10.8==10.8计算为false？

我有一个简单的程序来计算向量的和。下面是实现

double sum(vector<double> v) {
  double sum = 0;
  for (size_t i = 0; i < v.size(); i++) {
    sum += v[i];
  }
  return sum;
}

双和（向量v）{
双和=0；
对于（size_t i=0；i

但当我用十进制数测试时，它似乎不起作用

void test_sum_decimal() {
  cout << "test_sum_decimal" << endl;

  vector<double> test = {1.2, 3, 6.5, 0.1};
  cout << sum(test) << endl; // Prints 10.8
  if (sum(test) == 10.8) {
    cout << "EQUAL" << endl; // Doesn't print "EQUAL"
  }
  assert(sum(test) == 10.8); // Terminates program because expression is false

  cout << "PASS!" << endl;
}

void test\u sum\u decimal（）{
库特