sorting the title

[eman2013]

/*
*VsPod.cpp
*4-23-2013
*/

#include<iostream>
#include<vector>
#include<string>

using namespace std;

struct song
{
string t;
string a;
double l;
};

//A is less than B
void Add(vector<song> &l)
{
song ns;
cout<<"What is the name of the song?"<<endl;
getline(cin,ns.t);
cout<<"What is the artist name?"<<endl;
getline(cin,ns.a);
cout<<"What is the length of the song?"<<endl;
cin>>ns.l;
l.push_back(ns);
}
void Title(song.t)
{
string tt;

if(t>tt)
{

}

}
void Playlist()
{

}
int main()
{
vector<song>l;
int x;
while(x!=6)
{
cout<<"Hello welcome to VSPod."<<endl;
cout<<"(1) Add a song."<<endl;
cout<<"(2) Sort by title."<<endl;
cout<<"(3) Sort by artist."<<endl;
cout<<"(4) Sort by length."<<endl;
cout<<"(5) Print your playlist."<<endl;
cout<<"(6) EXIT."<<endl;
cout<<"Pick one:";
cin>>x;
cin.clear();
cin.sync();
if(x==1)
{
Add(l);
}
if(x==2)
{
Title();
}
if(x==3)
{

}
if(x==4)
{

}
if(x==5)
{

}
}
}

this is my code and my problem is im trying to sort the title but i cant acess the title file

[keskiverto]

You do have a std::vector<song>. See std::sort
http://www.cplusplus.com/reference/algorithm/sort/

Define a functor that takes two songs, compares their member t and returns result. t is std::string, so it already has operator<

[eman2013]

my problem wasn't how to compare the two songs but what i called the second song when i compared because i dont understand how to acess another song title because in the example from your link they have to variables that they compare to

[keskiverto]

At some point in your code you do use "ns.t", where "ns" is of type "song", and that type has member "t". So, what does that piece of code do?

[eman2013]

t stands for the title and ns is where the song the user enters is stored and each time the user enters a song it gets stored in l...do you know who to access the different ns in the vector l?

[keskiverto]

http://www.cplusplus.com/reference/vector/vector/

Multiple ways to access an element: operator[], at(), iterators. For example, first title (if l is not empty)
std::string title = l[0].t;

[eman2013]

Okay. That makes sense. I thought that since it wasn't a number being stored I couldn't just put o in the brackets. do you think that this sorting of the title is correct:

void Title(vector<song>l)
{
int n;
n++;
string t;
string tt;
for (int i=0; i<n; i++)
{
if(l[i].t>='a')
{
string t=l[i].t;
string tt=l[i+1].t;
if(t<tt)
{
cout<<l[i].t<<endl;
cout<<l[i+1].t<<endl;
}
}
}

:I'm trying to print to the other the songs in order from A->Z using the title