I need help changing my current program so that the user does notenter in how ma

Question

I need help changing my current program so that the user does notenter in how many number he/she will use and just starts to enterin the numbers. The program should have an array which can hold upto 50 numbers (without the user specifying this in the beginning).*Note: this only happens if the user decides to enter in thenumbers from the keyboard, not from the data file.* Here is mycode:

#include<iostream>
#include<fstream>
#include<iomanip>
using namespace std;

int arr_2d[50][2],count;

void convert_2d(int *arr,int num)
{
     int min=0,i,j,temp;
     extern int count;
     count =0;
    
     for (i = 0; i < num; i++)
     {
       if(min>arr[i])
       {
          min =arr[i];
       }
     }

     min = min-1;

     for (i=0; i < num; i++)
     {
       if (arr[i] == min)
         continue;
    
       arr_2d[count][0] = arr[i];
       arr_2d[count][1] = 1;
       arr[i] = min;
       for (j = i+1; j < num;j++)
       {
        if (arr[j] ==arr_2d[count][0])
        {
        arr_2d[count][1]++;
         arr[j] = min;
        }
       }    

       count++;
     }

     for (i=0; i < count; i++)
     {
      for (j = i+1; j < count; j++)
      {
       if (arr_2d[i][0] <arr_2d[j][0])
       {
        temp = arr_2d[i][0];
        arr_2d[i][0]=arr_2d[j][0];
        arr_2d[j][0] = temp;

        temp = arr_2d[i][1];
        arr_2d[i][1]=arr_2d[j][1];
        arr_2d[j][1] = temp;
       }
      }
     }
}

int main()
{
int arr[50];
extern int count;
char choice;
char file[100];
int i,num;

while(1)
{
cout << "Enter choice:" << endl << "1.Keyboard" << endl << "2.File" << endl <<"Any other input will end." << endl;
cin >> choice;
switch(choice)
{
   case '1':
   do
   {
    cout << "How many numbers you want toenter: ";
    cin >> num;
   } while(num <= 0 || num > 50);

for (i=0; i < num ;i++)
{
   cout << "Enter " << (i+1) << "num:";
   cin >> arr[i];
}
break;
case '2':
{
   cout << "Enter filename: ";
   cin >> file;
   ifstream myfile (file);
   num = 0;
   if (myfile.is_open())
   {
    while (! myfile.eof() )
    {
     myfile >> arr[num];
     num++;
     if (num >= 50)
     break;
    }

    myfile.close();
   }
   else cout << "Unable to open file";
}
break;
default :
{
   system("pause");
   return 0;
   break;
   }
}

convert_2d(arr,num);

   cout << endl;
   cout << setw(10) << "Number" <<setw(10) << "Count" << endl << endl;
  
for (i=0;i<count;i++)
{

   cout << setw(10) << arr_2d[i][0] <<setw(8) << arr_2d[i][1] << endl;
}
   cout << endl;
}
}

Any and all help with this is greatly appreciated.

Explanation / Answer

#include<iostream>
#include<fstream>
#include<iomanip>
using namespace std;

intarr_2d[50][2],count;

void convert_2d(int*arr,int num)
{
     int min=0,i,j,temp;
     extern int count;
     count =0;
    
     for (i = 0; i < num; i++)
     {
       if(min>arr[i])
       {
          min =arr[i];
       }
     }

    min = min-1;

    for (i=0; i < num; i++)
     {
       if (arr[i] == min)
         continue;
    
       arr_2d[count][0] = arr[i];
       arr_2d[count][1] = 1;
       arr[i] = min;
       for (j = i+1; j < num;j++)
       {
        if (arr[j] ==arr_2d[count][0])
        {
        arr_2d[count][1]++;
         arr[j] = min;
        }
      }    

       count++;
     }

    for (i=0; i < count; i++)
     {
      for (j = i+1; j < count; j++)
      {
       if (arr_2d[i][0] <arr_2d[j][0])
       {
        temp = arr_2d[i][0];
        arr_2d[i][0]=arr_2d[j][0];
        arr_2d[j][0] =temp;

        temp =arr_2d[i][1];
        arr_2d[i][1]=arr_2d[j][1];
        arr_2d[j][1] = temp;
       }
      }
     }
}

int main()
{
int arr[50];
extern int count;
char choice;
char file[100];
int i,num;

while(1)
{
cout << "Enter choice:" << endl << "1.Keyboard" << endl << "2.File" << endl <<"Any other input will end." << endl;
cin >> choice;
switch(choice)
{
   case '1':
  

for (i=0; i < 50;i++)
{
   cout << "Enter " << (i+1) << "num:(<0 to exit)";
   cin >> arr[i];
   if(arr[i]<0)
      {num=i;
       break;
       }
}
break;
case '2':
{
   cout << "Enter filename: ";
   cin >> file;
   ifstream myfile (file);
   num = 0;
   if (myfile.is_open())
   {
    while (! myfile.eof() )
    {
     myfile >> arr[num];
     num++;
     if (num >= 50)
     break;
    }

   myfile.close();
   }
   else cout << "Unable to open file";
}
break;
default :
{
   system("pause");
   return 0;
   break;
   }
}

convert_2d(arr,num);

   cout << endl;
   cout << setw(10) << "Number" <<setw(10) << "Count" << endl << endl;
  
for (i=0;i<count;i++)
{

   cout <<setw(10) << arr_2d[i][0] << setw(8) <<arr_2d[i][1] << endl;
}
   cout << endl;
}
}

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