delet the linenumber

[DANNY123]

I have some problem in using the fstream.
my objective is to delet the line number : such as a line 1.#include <iostream>
will be converted to #include <iostream> in the out. txt.
However, it doesn't work.

#include <iostream>

#include <fstream>
#include <string>
using namespace std;

string str;
void filter(string&str)
{  
    while(str.size()>0&&str[0]>='0'&&str[0]<=9||str[0]=='.')
    {          
         int length=str.length();
	for(int i=1;i<length; i++)
     str[i-1]=str[i];
	str[length-1]='\0';
}
               }
                                                                            
    

int main()
{    cout<<"the filter is initializing"<<endl;
   ifstream infile("in.txt");
   ofstream outfile("out.txt");
 
   while(getline(infile,str))
      {
         filter(str);
         for(int i=0;i<str.length();i++)
         {           cout<<str[i];
                  cout<<endl;
        outfile<<str;

      
         }
         }
          infile.close();
          outfile.close();
          system("pause");
          return 0;                   
                            
}

[Zaita]

You are not doing any checks. You need to put a check in filter() and then return a boolean (true on success, false on failure)

[Lowest0ne]

Out of curiosity, what does this print?

double x;
string str;
while (infile >> x && getline(infile, str))
  cout << str << '\n';

How does it handle the decimal? Do you break infile?

That line of thinking would be the way I would do it:

int x;
char decimal;
string line;

while ((infile >> x >> decimal) && getline(infile, str))
  cout << str << '\n';

~most sites have an ability to turn the line numbers off~

[DANNY123]

I think this would work.thanks

int x;
char decimal;
string line;

while ((infile >> x >> decimal) && getline(infile, str))
  cout << str << '\n';