Sorting arrays alphabetical

[alyssnyx]

I need to sort the array alphabetically but I really do not how. I tried to do it below but it didn't work.Any help is appreciated.

#include <iostream>
#include <fstream>
#include <string>

using namespace std;



void sort(ifstream& infile){
int number;
infile>>number;
string firstname,lastname,birthdate;
string firstname1[number],lastname2[number],birthdate3[number];


    //each line has 3 pieces of info. Was read successful?
for(int i=0; i<number; i++){
    infile>>firstname1[i]>>lastname2[i]>>birthdate3[i];
    cout<<firstname1[i]<<" "<<lastname2[i]<<" "<<birthdate3[i]<<endl;
}
string temp[number];

		for(int l=0; l<number; l++)
		{

			if(firstname1[l]>firstname1[l+1])
			{
				temp[l] += firstname1[l];

			}
			else
                temp[l]+=firstname1[l+1];

cout<<temp[l]<<endl;

		}


}
int main (){
string infile_name;
ifstream infile;

cout << "What file?";
cin>>infile_name;
infile.open(infile_name.c_str());

sort(infile);


}

[Zhuge]

If you have an array, you can just use std::sort(). What exactly are you doing in your code that isn't working?

[alyssnyx]

Well I want it to output to the user and it when I do that it doesn't output them in the order I need them to. How would I use the std::sort()?

[alyssnyx]

Also I they are parallel arrays so when I sort the names I need to be able to output the birthdate and last name along with it

[Zhuge]

Ugh, parallel arrays. I hope it is a requirement of your assignment that is giving you that, otherwise I would suggest simply making an array of structures and sorting that with std::sort().

alyssnyx wrote:

it doesn't output them in the order I need them to.

That doesn't really elaborate at all. You have effectively said "it doesn't work." What part isn't working? The variable declaration syntax? The loop syntax? The loop body code itself?

[alyssnyx]

Okay I changed up the code a bit

int index[number];
for(int i=0;i<number-1;i++){
    index[i]=i;
}

		for(int l=0; l<number-1; l++)
		{ int temp=0;

		    for(int j=l+1; j<number-1;j++){

			if(firstname1[index[l]]>firstname1[index[j]])
			{
				temp = index[l];
				index[l]=index[j];
				index[j]=temp;

			}


		    }
		}
for(int i=0;i<=number-1;i++){

    cout<<firstname1[index[i]]<<endl;
}

I really don't know how to do what you were talking about, but right now it sorts everything except the last element and then crashes. Any idea for what is wrong?

[alyssnyx]

Nevermind I got it, thank you for your reply though!