getline reads same line (C++,istream) - c++

Question

I try to find same lines between two text files.
while (getline (texta,str1)){
while (getline (textb,str2)){
cout<<str1<<str2<<endl;
}}
First while working very well but second one just read first part line of text and then quit. I've tried different textes but doesnt work.
If you want to look all code:
void similars(string text1,string text2){
string str1,str2;
ifstream texta(text1.c_str());
ifstream textb(text2.c_str());
if(texta.is_open() && textb.is_open()){
while (getline (texta,str1)){
while (getline (textb,str2){
cout<<str1<<str2<<endl;
}
}
}
else cout << "Unable to open file";
}

Answer 1

don't mix things those shouldn't do
consider this example:
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
void similars(string text1, string text2)
{
string str1, str2;
ifstream texta(text1.c_str(), ios::in);
ifstream textb(text2.c_str(), ios::in);
cout << "text1: " << endl << endl;
while(!texta.eof())
{
getline (texta, str1);
cout << str1 << endl;
}
cout << endl << endl;
texta.close(); // closing safely the file
cout << "text2: " << endl << endl;
while(!textb.eof())
{
getline (textb, str2, '\n');
cout << str2 << endl;
}
textb.close();
cout << endl;
}
int main()
{
system("color 1f");
string sText1 = "data1.txt";
string sText2 = "data2.txt";
similars(sText1, sText2);
system("pause");
return 0;
}
just create two text files with notepad or any text editor, rename them to "text1.txt", "text2.txt" and put some text in them and save and close. then run the program.