C++ 中的向量输出

Question

我编写了一个程序，输出记录霜冻的最大和最小天数以及相应的年份和月份。我正在从文件中读取这些数据并将我需要的内容输入到向量中。

在文件中，月份以整数 1-12 显示，我的问题是在我的程序中输出月份时，当文件中的月份为 1 时，如何输出 "January"？

Answer 1

您可以制作 std::array 个 std::string。索引将对应于月份名称。只要确保您考虑了基于 0 的索引，例如"January" == 0，不是 1。

std::array<std::string, 12> months = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

然后

cout << "The highest number of days frost was recorded is: " 
     << maxFrost 
     << ". The date was: " 
     << months[maxMonth - 1]   // adjust to 0-based index
     << ", " 
     << maxFyear 
     << ".\n" 
     <<endl; // maximum frost with month and year

Answer 2

如果你的编译器不支持std::array，你可以使用固定的字符数组：

static const char * month_names[] =
{
  "Dummy", // to make names line up with month numbers.
  "January", "February", "March", "April", "May", "June",
  "July", "August", "September", "October", "November", "December",
};

int main(void)
{
  for (unsigned int m = 1; m <= 12; ++m)
  {
    cout << m << ") " << month_names[i] << endl;
  }
  return EXIT_SUCCESS;
}

注意：char *类型用于数组，因为char *可以作为固定数据存储并直接访问。使用 std::string 将涉及在访问它们之前为每个月份名称创建一个 std::string 实例。

C++ 中的向量输出

vector output in C++

c++

vector