使用switch将整数更改为字符串

问题描述

我需要将整数转换为字符串。整数是most_occurred_number，我无法确定要插入代码中的整数。我已将most_occurred_number设置为整数，但cout中没有任何变化。我尝试放入month1 [i]，但是即使在代码中，它也会出现未声明标识符的错误。

#include <string>
#include <algorithm>
#include <map>
#include <array>
#include <iomanip>

using namespace std;

int dayofweek(int d,int m,int y)
{
    static int t[] = { 0,3,2,5,1,4,6,4 };
    y -= m < 3;
    return ( y + y / 4 - y / 100 +
             y / 400 + t[m - 1] + d) % 7;
}

std::string to_date_string1(int most_occurred_number1)
{
    switch(most_occurred_number1)
    {
    case 1:
        return "Monday";
    case 2:
        return "Tuesday";
    case 3:
        return "Wednesday";
    case 4:
        return "Thursday";
    case 5:
        return "Friday";
    case 6:
        return "Saturday";
    case 7:
        return "Sunday";
    }
}

std::string to_date_string2(int most_occurred_number2)
{
    switch(most_occurred_number2)
    {
    case 1:
        return "Monday";
    case 2:
        return "Tuesday";
    case 3:
        return "Wednesday";
    case 4:
        return "Thursday";
    case 5:
        return "Friday";
    case 6:
        return "Saturday";
    case 7:
        return "Sunday";
    }
}

void most_occurred_number1(int month1[],int size1)
{
  int max_count1 = 0;
  cout << "\nMost occurred number: ";
  for (int i=0; i<size1; i++)
  {
   int count1=1;
   for (int j=i+1;j<size1;j++)
       if (month1[i]==month1[j])
           count1++;
   if (count1>max_count1)
      max_count1 = count1;
  }

  for (int i=0;i<size1;i++)
  {
   int count1=1;
   for (int j=i+1;j<size1;j++)
       if (month1[i]==month1[j])
           count1++;
   if (count1==max_count1)
       cout << month1[i] << endl;
  }
 }

void most_occurred_number2(int month2[],int size2)
{
  int max_count2 = 0;
  cout << "\nMost occurred number: ";
  for (int i=0; i<size2; i++)
  {
   int count2=1;
   for (int j=i+1;j<size2;j++)
       if (month2[i]==month2[j])
           count2++;
   if (count2>max_count2)
      max_count2 = count2;
  }

  for (int i=0;i<size2;i++)
  {
   int count2=1;
   for (int j=i+1;j<size2;j++)
       if (month2[i]==month2[j])
           count2++;
   if (count2==max_count2)
       cout << month2[i] << endl;
  }
 }

int main()
{
    int day1 = dayofweek(03,02,2020); //month 1 days
    int day2 = dayofweek(04,2020);
    int day3 = dayofweek(04,2020);
    int day4 = dayofweek(05,2020);
    int day5 = dayofweek(11,2020);
    int day6 = dayofweek(12,2020);
    int day7 = dayofweek(13,2020);
    int day8 = dayofweek(20,2020);
    int day9 = dayofweek(21,2020);
    int day10 = dayofweek(27,2020);

    int day11 = dayofweek(02,03,2020); //month 2 days
    int day12 = dayofweek(02,2020);
    int day13 = dayofweek(05,2020);
    int day14 = dayofweek(10,2020);
    int day15 = dayofweek(11,2020);
    int day16 = dayofweek(11,2020);
    int day17 = dayofweek(17,2020);
    int day18 = dayofweek(19,2020);
    int day19 = dayofweek(24,2020);
    int day20 = dayofweek(25,2020);

    int month1 [] = {day1,day2,day3,day4,day5,day6,day7,day8,day9,day10};
    int n1 = sizeof(month1)/sizeof(month1[0]);
    cout << "Original array: ";
    for (int i=0; i < n1; i++)
    cout << month1[i] <<" ";
    most_occurred_number1(month1,n1);

    int month2 [] = {day11,day12,day13,day14,day15,day16,day17,day18,day19,day20};
    int n2 = sizeof(month2)/sizeof(month2[0]);
    cout << "Original array: ";
    for (int i=0; i < n2; i++)
    cout << month2[i] <<" ";
    most_occurred_number2(month2,n2);

}```

解决方法

我需要将整数转换为字符串。

然后使用std::to_string https://en.cppreference.com/w/cpp/string/basic_string/to_string

整数是most_occurred_number

此代码中没有int类型的此类变量。我可以看到most_occurred_number1和most_occurred_number2是函数参数-它们似乎（几乎）在switch语句中得到了正确处理。几乎-因为您的to_date_string1和to_date_string2并不总是返回值-在c ++中是未定义的行为-您可能会添加return "?"或抛出异常，以防未正确使用值调用函数范围。

我将most_occurred_number用作整数，但cout中没有任何变化

您应该在代码中显示您试图放置most_occurred_number

的位置

我尝试放入month1 [i]，但即使在代码中，它也会出现未声明标识符的错误。

数组month1是most_occurred_number1的参数，也是main中的变量，这是唯一可见的地方。