C++ String Arrays

[Vyx]

Is it possible to use an array for strings? I'll just post my code as it's easier to describe what I'm talking about. What this does is reads current, and average rainfall, then computes the variance. It then outputs it in a "table" style format.

The thing I can't get it to do is output the months. I made an array of type string but I get an error. I'm starting to think that I can't actually use a string array in the way that I'm trying. Anyone know another way to do this...or a way to correct what I have?

#include <iostream>
#include <iomanip>
#include <cmath>
#include <cctype>
#include <cstring>
#include <fstream>
using namespace std;

const int SIZE = 12;
int main()
{
	double actual[SIZE], average[SIZE], variance[SIZE];
	string month[SIZE]= {"Jan", "Feb", "Mar", "Apr", "May", "June", "July", "Aug", "Sep", "Oct", "Nov", "Dec"};
	//open avg, and actual files that have input in them, and creating asg5output.txt for output
	ifstream inavg, inact;
	ofstream outf;
	inavg.open("asg5average.txt");
	inact.open("asg5rainfall.txt");
	outf.open("asg5output.txt");
	
	for (int i=0; i<SIZE; i++) //getting input into average and actual
	{
		inavg >> average[i];
		inact >> actual[i];
	}
	//calculate variance
	for (int i=0; i<SIZE; i++)
	{
		variance[i]=((actual[i]-average[i])/average[i])*100;
	}
	//output
	cout<<"\tRainfall Comparison"<<endl<<endl;
	cout<<"Month"<<"\tActual"<<"\tAverage"<<"\tVariance\n";
	cout<<"_____"<<"\t______"<<"\t_______"<<"\t________\n";
	for (int i=0; i<SIZE; i++)
	{
		cout<<noshowpos<<"\n"<<month[i]<<"\t"<<actual[i]<<"\t"<<average[i];
		cout<<showpos<<"\t"<< variance[i];
	}
	
	cout<<endl<<endl;

	inavg.close();
	inact.close();
	outf.close();
	return 0;
}

[bfcx]

You know your missing the closing } on the main function? I compiled your code and it ran fine and printed the months. (though you might want to have some error handeling on opening your files, cuz i didnt have the files and it just grabbed random memory locations).

Other than that i dont see a problem.

[Vyx]

Yea, I just accidnentally didn't copy the last closing brace.

I've attached the two text files that I was using.

The error I keep getting is: Error 1 error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion)

This is using Visual Studio 2005 Pro. What compiler were you using to compile it?

[jkrohn]

Quote:

I made an array of type string but I get an error.

Just for future reference, it is much more helpful to post the actual compiler error than "this code causes an error".

Otherwise yes, it is possible to make an array of pretty much any object in C++.

Jkrohn

[Rootstonian]

Been a while since my C++ days...try casting it

cout << (string)month[i]...

[bfcx]

It worked fine in DevC++ using GCC 3.4.1

[Vyx]

Incase anyone looks over this in the future, the reason that it wasn't working was that I was using #include <cstring> when I should have just been using #include <string>.

[exally]

char* ftw