Question

I have a string with large content. I have to separate out content of string before the first newline character and after the newline character.
string content is as follows:

std::string = "exption is theo  from my fimnct!
               mt nsamre id kjsdf dskfk djfhj
               /vonsfs/sdvfs/sdvjisd/dd.so
               dfjg dfk dflkkm sdfk " 

from above i have to get the content of first line upto the newline charcter in another string and keep the other content remain unchanged. The characters in first line are not fixed. it is variable sting.

Answer 1

Try std::algorithms:

int main (void)
{
    std::string input(
        "exption is theo  from my fimnct!\n"
        "mt nsamre id kjsdf dskfk djfhj\n"
        "/vonsfs/sdvfs/sdvjisd/dd.so\n"
        "dfjg dfk dflkkm sdfk"
    );

    std::string first_line(input.begin(), std::find(input.begin(), input.end(), '\n'));
    std::string rest_lines(std::find(input.begin(), input.end(), '\n'), input.end());

    std::cout << first_line << std::endl;
    std::cout << "---" << std::endl;
    std::cout << rest_lines << std::endl;

    return 0;
}

This prints out

exption is theo  from my fimnct!
---

mt nsamre id kjsdf dskfk djfhj
/vonsfs/sdvfs/sdvjisd/dd.so
dfjg dfk dflkkm sdf