Help with array...

**justin8077** · 08-17-2011

I'm new to C++, if anyone can help me, i'll be grateful.

The question is a follow:
User will be asked to key in the number of players (maximum 5 players) that challenge each other for top ranking. Their name will then be taken in one by one. Assume the names will not exceed 29 characters including spaces.

My question is how to store the name into an array. I only know how to store one player's name into it. And why is it always start with the 2nd participants instead of the first one??

Here is my code:

Code:

#include<iostream>
using namespace std;
int main(void)
{
	int no_participants;
	int crtl_1;
	char name_participants[30];

	cout<<"Please enter the number of participants (1-5):";
	cin>>no_participants;
	
	for (crtl_1=1; crtl_1<=no_participants; crtl_1++)
	{
		cout<<"Please enter the name of participants "<<crtl_1 <<":";
		cin.getline (name_participants, 30);
		cout<<endl;
	}
	cout<<name_participants;
	cout<<endl;
	return 0;
}

**grumpy** · 08-17-2011

Declare name_participants as a two dimensional array (char name_participants[5][30] declares an array of five elements, each of which has 30 char). Then supply name_participants[some_index] to the cin.getline() call. (I'll leave it to you to work out what some_index should be in your code).

You will also need a loop to print out the name_participants array.

Keep in mind that array indexing starts from 0, not 1.

**AndrewHunter** · 08-17-2011

And being C++, you would benefit from looking at the Standard Template Library, specifically std::vector and std::map.

**manasij7479** · 08-17-2011

Originally Posted by AndrewHunter

And being C++, you would benefit from looking at the Standard Template Library, specifically std::vector and std::map.

Shouldn't a std::array<std::string,5> be less complicated ?
or just a std::string names[5]; //if no C++11 support..

**rogster001** · 08-17-2011

Shouldn't a std::array<std::string,5> be less complicated ?
or just a std::string names[5]; //if no C++11 support..

I think its because the study question posted suggests they were instructed to use c style arrays, or have perhaps been studying them, or i would have thought similar

Assume the names will not exceed 29 characters including spaces.

**AndrewHunter** · 08-17-2011

Actually, std::map is the way to go with this one for the simplest solution if ranking the names is something that the OP is going to need to consider later in his program. I don't normally do this, however my new pet peeve is seeing C code in C++, so:

Code:

#include <iostream>
#include <string>
#include <map>

int main(){

	std::map<int, std::string>NameList;
	std::map<int,std::string>::iterator ii;
	std::string Name;
	int rank;

	for(int i=0;i<5;i++){
		std::cout<<"Enter name: ";
		std::getline(std::cin, Name);
		std::cout<<"Enter rank: ";
		std::cin >> rank;
		std::cin.ignore();
		NameList.insert(std::pair<int,std::string>(rank,Name));
	}

	for(ii=NameList.begin(); ii!= NameList.end(); ii++){
		std::cout<<ii->first <<" "<<ii->second<<std::endl;
	}

	std::cin.get();
	return(0);
}

**AndrewHunter** · 08-17-2011

Originally Posted by rogster001

I think its because the study question posted suggests they were instructed to use c style arrays, or have perhaps been studying them, or i would have thought similar

And I don't doubt that one bit, I am just tired of broken curriculums.

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