Question

I need to make a few changes to this C++ program,first of all it should read the file from the computer without asking the user for the name of it.The name of the file is MichaelJordan.dat, second of all it should print ,3 highest frequencies are: 3 words that occure the most.everything else is good.

#include <iostream>
#include <map>
#include <string>
#include <cctype>
#include <fstream>
#include <iomanip>

using namespace std;
void addWord(map<std::string,int> &words,string s);
void readFile(string infile,map<std::string,int> &words);
void display(map<std::string,int> words);
  
int main() {
// Declaring variables
std::map<std::string,int> words;
  
  
//defines an input stream for the data file
ifstream dataIn;

  
string infile;
cout<<"Please enter a File Name :";
cin>>infile;
readFile(infile,words);
  
display(words);

  
return 0;
}
void readFile(string infile,map<std::string,int> &words)
{
string s;
//defines an input stream for the data file
ifstream dataIn;
//Opening the input file
dataIn.open(infile.c_str());
//checking whether the file name is valid or not
if(dataIn.fail())
{
cout<<"'"<<infile<<"' File Not Found **";
exit(0);
}
else
{
//counting how many words in the file
while(dataIn>>s)
{
addWord(words,s);
}
dataIn.close();
}
}
void addWord(map<std::string,int> &words,string s)
{
char c;
string str="";
for(unsigned int i=0;i<s.length();i++)
{
c=s[i];
if(isalpha(c))
str.push_back(std::toupper(c));
}
++words[str];
}
void display(map<std::string,int> words)
{

cout<<"---------------------"<<endl;
cout<<"Word Counter Summary "<<endl;
cout<<"---------------------"<<endl;
cout<<"\nWord\t\tCount"<<endl;
cout<<"------\t\t-----"<<endl;
  
for(std::map<std::string,int>::iterator iter = words.begin(); iter!=words.end(); ++iter)
{
cout<<setw(16)<<left<<iter->first<<setw(5)<<right<<iter->second<<std::endl;
}
  
}

Answer 1

Here is the solution to above problem in C++. Please read the code comments for more information

Please give a thumbs up!!!!

Explanation

1) fixed infile name to MichaelJordan.dat

2) scan the map and check for maximum frequency in display method and save the word

3) for the second and third most frequent word do same as for first word but also check if second if not equal to first and third is not equal to both first and second while checking in the map

C++ Code

#include <iostream>
#include <map>
#include <string>
#include <cctype>
#include <fstream>
#include <iomanip>

using namespace std;
void addWord(map<std::string,int> &words,string s);
void readFile(string infile,map<std::string,int> &words);
void display(map<std::string,int> words);
  
int main() {
// Declaring variables
std::map<std::string,int> words;
  
  
//defines an input stream for the data file
ifstream dataIn;

//fixing the fileName
string infile="MichaelJordan.dat";
readFile(infile,words);
  
display(words);

  
return 0;
}
void readFile(string infile,map<std::string,int> &words)
{
string s;
//defines an input stream for the data file
ifstream dataIn;
//Opening the input file
dataIn.open(infile.c_str());
//checking whether the file name is valid or not
if(dataIn.fail())
{
cout<<"'"<<infile<<"' File Not Found **";
exit(0);
}
else
{
//counting how many words in the file
while(dataIn>>s)
{
addWord(words,s);
}
dataIn.close();
}
}
void addWord(map<std::string,int> &words,string s)
{
char c;
string str="";
for(unsigned int i=0;i<s.length();i++)
{
c=s[i];
if(isalpha(c))
str.push_back(std::toupper(c));
}
++words[str];
}
void display(map<std::string,int> words)
{

cout<<"---------------------"<<endl;
cout<<"Word Counter Summary "<<endl;
cout<<"---------------------"<<endl;
cout<<"\nWord\t\tCount"<<endl;
cout<<"------\t\t-----"<<endl;
  
for(std::map<std::string,int>::iterator iter = words.begin(); iter!=words.end(); ++iter)
{
cout<<setw(16)<<left<<iter->first<<setw(5)<<right<<iter->second<<std::endl;
}

//3 word which occur with most frequency
//first word
int freq=0;
string firstword="";
for(std::map<std::string,int>::iterator iter = words.begin(); iter!=words.end(); ++iter)
{
   if(iter->second>freq)
   {
       firstword=iter->first;
       freq=iter->second;
   }
}
//print the first word
cout<<"1st MOST FREQUENT WORD: "<<firstword<<endl;
//second word
string secondword="";
freq=0;
for(std::map<std::string,int>::iterator iter = words.begin(); iter!=words.end(); ++iter)
{
   //check if not equal to first word
   if(iter->second>freq &&(iter->first.compare(firstword)!=0))
   {
       secondword=iter->first;
       freq=iter->second;
   }
}
//print the first word
cout<<"2nd MOST FREQUENT WORD: "<<secondword<<endl;
//third word
string thirdword="";
freq=0;
for(std::map<std::string,int>::iterator iter = words.begin(); iter!=words.end(); ++iter)
{
   //check if not equal to first word and second word
   if(iter->second>freq &&(iter->first.compare(firstword)!=0) &&(iter->first.compare(secondword)!=0))
   {
       thirdword=iter->first;
       freq=iter->second;
   }
}
//print the first word
cout<<"3rd MOST FREQUENT WORD: "<<thirdword<<endl;

}