如何将具有功能的日历程序输出到.txt文件

How to output a calendar program with functions to a .txt file

本文关键字：输出 程序 txt 文件 日历 功能      更新时间：2023-10-16

我遇到的问题是弄清楚我的程序有什么问题以及为什么它不会写入我指定的输出文件。

#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <fstream>
using namespace std;
int numOfDaysInAMonth(int, int);
void printMonth(int);
void printDaysofMonth(int, int&);
void skipToDay(int);
int main()
{
  ofstream ofile;
  ofile.open("calendar.txt");
  int year, firstDayInCurrentMonth;
  int currentMonth = 1;
  int numDays;
  cout << "What year is this? ";
  cin >> year;
  cout << endl;
  cout << " 0 - Sundayn";
  cout << " 1 - Mondayn";
  cout << " 2 - Tuesdayn";
  cout << " 3 - Wednesdayn";
  cout << " 4 - Thursdayn";
  cout << " 5 - Fridayn";
  cout << " 6 - Saturdayn";
  cout << "What day of then week is Jan 1? ";
  cin >> firstDayInCurrentMonth;
  ofile << year << endl;
  while (currentMonth <= 12) {
    numDays = numOfDaysInAMonth(currentMonth, year);
    printMonth(currentMonth);
    printDaysofMonth(numDays, firstDayInCurrentMonth);
    ofile << endl << endl << endl;
    currentMonth = currentMonth + 1;
  }
  ofile << endl;
  system("pause");
  return 0;
}

我使用ile来输出文本，但没有正确返回。

// This function returns the number of days in a month
int numOfDaysInAMonth(int m, int y)
{
  if (m == 1)
    return(31);
  else if (m == 2 && y % 4 != 0)
    return(28);
    if (m == 2 && y % 4 == 0)
        return(29);
  else if (m == 3)
    return(31);
  else if (m == 4)
    return(30);
  else if (m == 5)
    return(31);
  else if (m == 6)
    return(30);
  else if (m == 7)
    return(31);
  else if (m == 8)
    return(31);
  else if (m == 9)
    return(30);
  else if (m == 10)
    return(31);
  else if (m == 11)
    return(30);
  else if (m == 12)
    return(31);
}
    // It takes the number of the month and prints outs the name of the month and the frame of the calander
void printMonth(int m)
{
  ofstream ofile;
  ofile.open("calendar.txt");
  if (m == 1)
  {
    ofile << "January" << endl;
  }
  else if (m == 2)
  {
    ofile << "February" << endl;
  }
  else if (m == 3)
  {
    ofile << "March" << endl;
  }
  else if (m == 4)
  {
    ofile << "April" << endl;
  }
  else if (m == 5)
  {
    ofile << "May" << endl;
  }
  else if (m == 6)
  {
    ofile << "June" << endl;
  }
  else if (m == 7)
  {
    ofile << "July" << endl;
  }
  else if (m == 8)
  {
    ofile << "August" << endl;
  }
  else if (m == 9)
  {
    ofile << "September" << endl;
  }
  else if (m == 10)
  {
    ofile << "October" << endl;
  }
  else if (m == 11)
  {
    ofile << "November" << endl;
  }
  else if (m == 12)
  {
    ofile << "December" << endl;
  }

  ofile << " S  M  T  W  T  F  S" << endl;
  ofile << "_____________________" << endl;
}
// Helps with the skipToDay function
void skip(int i)
{
  ofstream ofile;
  ofile.open("calendar.txt");
  while (i > 0)
  {
    ofile << " ";
    i = i - 1;
  }
}
// This function prints out the days in the month after the header for each month
void printDaysofMonth(int numDays, int &weekDay)
{
  ofstream ofile;
  ofile.open("calendar.txt");
  int day = 1;
  skipToDay(weekDay);
  while (day <= numDays)
  {
    ofile << setw(2) << day << " ";
    if (weekDay == 6)
    {
      ofile << endl;
      weekDay = 0;
    }
    else weekDay = weekDay + 1;
    day = day + 1;
  }
}
// Prints spaces in monthly calander
void skipToDay(int d)
{
  return skip(3 * d);
}

void printDaysofMonth(int numDays, int &weekDay)
{
    ofstream ofile;
    ofile.open("calendar.txt");
    ...
}
int main()
{
  ofstream ofile;
  ofile.open("calendar.txt");
  printDaysofMonth(...);
  ofile << "data...";
  ...
}

文件已经打开。第一个流将写第二个流的写入（如果有的话）。通过参考将功能更改为传递ofstream：

void printDaysofMonth(ofstream &ofile, int numDays, int &weekDay)
{
    ...
}
int main()
{
  ofstream ofile;
  ofile.open("calendar.txt");
  printDaysofMonth(ofile, ...);
  ...
}

您可以通过将数据保存在数组中，以使程序较短。较少的键入意味着较小的潜在错误。

int is_leap_year(int y)
{
    return (y % 4) == 0 && y % 100 != 0 || y % 400 == 0;
}
int numOfDaysInAMonth(int m, int y)
{
    int days = 0;
    if(m >= 1 && m <= 12)
    {
        const int days_in_month[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
        int days = days_in_month[m - 1];
        if(m == 2 && is_leap_year(y))
            days++;
    }
    return days;
}
const char* get_month_name(int m)
{
    const char *month_name[] = { 
        "January", "February", "March", "April", "May", "June", 
        "July", "August", "September", "October", "November", "December" };
    if(m >= 1 && m <= 12)
        return month_name[m - 1];
    return "month name error";
}
void printMonth(ofstream &ofile, int m)
{
    ofile << get_month_name(m) << "n";
    ofile << " S  M  T  W  T  F  S" << endl;
    ofile << "_____________________" << endl;
}
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