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using isalpha fuction

chofs (49)
hey guys just wanted to know where in my code can i place the isalpha function to ignore digits and other puntuations...my code runs by the way.....thanks in advance 

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 // string::size
#include <iostream>
#include <string>
#include <fstream>
using namespace std;

int main ()
{
  std::string str;
  ifstream infile("input.txt");

  int a=0,b=0,c=0,d=0,e=0,f=0,g=0,h=0,i=0,j=0;
  int num=0;

  while(!infile.eof())
  {

       infile>>str;

       for(int i=0;i<str.size();i++)
       {

           if(str.size()==1)
           {
               a++;
           }
            if(str.size()==2)
           {
               b++;
           }
           else if(str.size()==3)
           {
               c++;
           }
           else if(str.size()==4)
           {
               d++;
           }
           else if(str.size()==5)
           {
               e++;
           }
           else if(str.size()==6)
           {
               f++;
           }
           else if(str.size()==7)
           {
               g++;
           }
           else if(str.size()==8)
           {
               h++;
           }
           else if(str.size()==9)
           {
               i++;
           }
           else if(str.size()==10)
           {
               j++;
           }
           str.clear();

}

}
  cout<<a<<"  "<<b<<"  "<<c<<"  "<<d<<"  "<<e<<"  "<<f<<"  "<<g<<"  "<<h<<"  "<<i<<"  "<<j<<endl;
return 0;
}
codewalker (394)
Yes you can
chofs (49)
i got the code working here it is 
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// string::size
#include <iostream>
#include <string>
#include <fstream>
#include <cctype>
using namespace std;

int main ()
{
  std::string str;
  ifstream infile("input.txt");

  int a=0,b=0,c=0,d=0,e=0,f=0,g=0,h=0,i=0,j=0;
  int num=0;

  while(!infile.eof())
  {

       infile>>str;

       for(int i=0;i<str.size();i++)
       {

           if((str.size()==1)&&(isalpha(str.at(i))))
           {
               a++;
           }
            else if((str.size()==2)&&(isalpha(str.at(i))))
           {
               b++;
           }
           else if((str.size()==3)&&(isalpha(str.at(i))))
           {
               c++;
           }
           else if((str.size()==4)&&(isalpha(str.at(i))))
           {
               d++;
           }
           else if((str.size()==5)&&(isalpha(str.at(i))))
           {
               e++;
           }
           else if((str.size()==6)&&(isalpha(str.at(i))))
           {
               f++;
           }
           else if((str.size()==7)&&(isalpha(str.at(i))))
           {
               g++;
           }
           else if((str.size()==8)&&(isalpha(str.at(i))))
           {
               h++;
           }
           else if((str.size()==9)&&(isalpha(str.at(i))))
           {
               i++;
           }
           else if((str.size()==10)&&(isalpha(str.at(i))))
           {
               j++;
           }
           str.clear();

}

}
  cout<<a<<"  "<<b<<"  "<<c<<"  "<<d<<"  "<<e<<"  "<<f<<"  "<<g<<"  "<<h<<"  "<<i<<"  "<<j<<endl;
return 0;
}
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