#include <fstream>
#include <iostream>
 
using namespace std;
int main()
{
 ifstream openfile;                    
//input file
 openfile.open("modelset.txt");  
//input file
 
 char bigarray[300];
//array that takes value of the whole line being scanned
 char thearray[300];
//array that takes value of big array until =="model=" or '\n'
 char str;
//character (used in thearray to go through each value of bigarray
 
 ofstream File;                     
//output file (is created)
    File.open("testmodel.txt"); 
//output file (is created)
 
    while(!openfile.eof()) 
//while input isnt at the end of the file
    {                                           
        openfile.getline(bigarray,300); 
//set the current line values to bigarray
        int i=0;
//used to go through thearray one spot at a time
 
        while (str !='\n' && thearray!="model=") 
//set all values of thearray to bigarray until its end of line or "model="
        {
              thearray[i] = bigarray[i];                   
              i++;
        }
 
        i=0;    
//set i back to 0 so thearray starts at thearray[0]
 
        if (thearray=="model=")  
//see if its =="model="
        {
           delete [] thearray; 
//clear all values of thearray (is this right?)
           int testarray=1;
//boolean used so I don't effect the value of thearray
 
           while ( testarray==1 ) 
//while my boolean is true (redundant but important)
           {
                 openfile.get(str);
//start scanning thearray again (this starts after model=)
                 thearray[i] = str;  
                 i++;
                 if (str=='\n'); 
//set my boolean false if its end of line
                 {
                    testarray = 0;
                 }
           }
 
        File << thearray << "\n"; 
//print thearray (the numbers after "model=") into my output file "File" (testmodel.txt)
        }   
 }
}

while (str !='\n' && thearray!="model=") 
//set all values of thearray to bigarray until its end of line or "model="
        {
              thearray[i] = bigarray[i];                   
              i++;
        }

[m][o][d][e][l][=][\0][4][9][5][2]

// Not tested
#include <fstream>
#include <string>
 
int main ()
{
    using namespace std ;
 
    string my_str ;
    const char search[] = "model=" ;
    size_t size = strlen (search) ;
    size_t pos = 0 ;
 
    ifstream in ("modelset.txt") ;
    ofstream out ("output.txt") ;
 
    while ( getline(in, my_str).good () )
    {
        if ( (pos = my_str.find (search, 0)) != string::npos )
        {
            my_str = my_str.erase (pos, size) ;
            out << atoi (my_str.c_str()) << '\n';
        }
    }
 
    // close the file streams
    in.close () ;
    out.close () ;
 
    getchar ( ) ;
    return 0 ;
}