C++ string replacer

#include <cstdlib>
#include <iostream>
#include <fstream>

using namespace std;

string *fromStrings=new string[1000];
string *toStrings=new string[1000];
int members;
/**
 * Loads a language into the arrays.
 * The syntax of the file should be old:new
 * @param filename - The path to the file
 */
void loadLanguage(string filename,int lines)
{
    string buffer;
    members=lines;

    ifstream file(filename.c_str());
    for(int index=0; index<lines; index++)
    {
    getline(file,buffer);

    if(buffer.find(":")!=-1){
    toStrings[index]=buffer.substr(0,buffer.find(":"));
    fromStrings[index]=buffer.substr(buffer.find(":"),buffer.length());
   }
    }
}
//!Not my work
void replaceAll(std::string& str,  std::string& from,  std::string& to) {
    size_t start_pos = 0;
    while((start_pos = str.find(from, start_pos)) < std::string::npos) {
        str.replace(start_pos, from.length(), to);
        start_pos += to.length();
    }
}

/**
 * Compiles the language set up by loadLangauge.
 * It really just places it in a text file in C++.
 * @param fileName - Where to find the file
 * @param lines    - How many lines the file has.
 */
void compile(string fileName,int lines){

    string line[lines];
    ifstream reader(fileName.c_str());

    for(int index=0; index<lines; index++)
        getline(reader, line[index]);

    for(int index=0; index<lines; index++)
    {
        for(int secInd=0; secInd<members; secInd++)
        {
            replaceAll(line[index],toStrings[secInd],fromStrings[secInd]);
        }
        cout << line[index]<<endl;
    }
    reader.close();
}
int main(){
    loadLanguage("/home/nate/langdefines",10);

    compile("/home/nate/code",3);

    return 0;
}