C++ Code : Problem A: Birthdays again... ( this code most be written in C++, Tha

Question

C++ Code:

Problem A: Birthdays again... (this code most be written in C++, Thanks)

Write a program that opens a file of the users choice that contains a list of birthdays. Extract from this file two things: (1) the date with the most common birthday (all of them) and (2) the month with the most people born. We will not test for a tie in either of these statistics.

The file tested will always be in the format: mm/dd/yyyy

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Sample birthday files:

bday1.txt

-------------------------------------------------------------------------------------------------------------------------------------------

bday2.txt

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Example 1(user input is Italic):

Enter file name:

bday1.txt

Most common birthday:

1/1

Most common birthday month:

3

Example 2(user input is underlined):

Enter file name:

bday2.txt

Most common birthday:

8/15

Most common birthday month:

8

Explanation / Answer

c++ code:

#include <bits/stdc++.h>
using namespace std;

int main()
{
   cout << "Enter name of input file!" << endl;
   string filename;
   cin >> filename;
   string line;
   ifstream myfile (filename.c_str());
   std::map<int, int> day;
   std::map<int, int> month;  
   std::map<int,int>::iterator it;
   if (myfile.is_open())
   {
   while ( getline (myfile,line) )
   {
       string str = line;
       for (int i=0; i<str.length(); i++)
       {
       if (str[i] == '/')
       str[i] = ' ';
       }
       line = str;
   string buf; // Have a buffer string
   stringstream ss(line); // Insert the string into a stream
   vector<string> tokens; // Create vector to hold our words
   while (ss >> buf)
   tokens.push_back(buf);

   it = day.find(atoi(tokens[0].c_str()) );
   if (it != day.end())
   {
       day[atoi(tokens[0].c_str())] += 1;
   }
   else
   {
       day[atoi(tokens[0].c_str())] = 1;
   }

   it = month.find(atoi(tokens[1].c_str()) );
   if (it != month.end())
   {
       month[atoi(tokens[1].c_str())] += 1;
   }
   else
   {
       month[atoi(tokens[1].c_str())] = 1;
   }
   }

   int dayfreq = 0;
   int bestday = 0;
   for (it=day.begin(); it!=day.end(); ++it)
   {
   if(it->second >= dayfreq)
   {
       dayfreq = it->second;
       bestday = it->first;

   }
   }

   int monthfreq = 0;
   int bestmonth = 0;
       for (it= month.begin(); it!=month.end(); ++it)
       {
       if(it->second >= monthfreq)
       {
           monthfreq = it->second;
           bestmonth = it->first;
       }
       }
       cout << "Most frequent birthday is " << bestmonth << endl;
       cout << "Most frequent Month is " << bestday << endl;
   myfile.close();
   }
   else
   {
   cout << "Unable to open file" << endl;
   exit(1);
   }          
   return 0;
}

Sample Output:

Enter name of input file!
birth1.txt
Most frequent birthday is 1
Most frequent Month is 3

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