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How do you convert std::string into an int?

I'm writing a program that is to display rainfall amounts, the rainfall amounts is input from a user then we are to display the months and amount in descending order. I thought I had my code written correctly following my book, but i get all these errors:
 c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(17) : error C2057: expected constant expression
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(17) : error C2466: cannot allocate an array of constant size 0
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(79) : error C2082: redefinition of formal parameter 'months'
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(79) : error C2440: 'initializing' : cannot convert from 'std::string []' to 'std::basic_string<_Elem,_Traits,_Ax>'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>,
            _Ax=std::allocator<char>
        ]
        No constructor could take the source type, or constructor overload resolution was ambiguous
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(84) : error C2440: 'initializing' : cannot convert from 'char' to 'std::basic_string<_Elem,_Traits,_Ax>'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>,
            _Ax=std::allocator<char>
        ]
        No constructor could take the source type, or constructor overload resolution was ambiguous
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(85) : error C2784: 'bool std::operator <(const std::basic_string<_Elem,_Traits,_Alloc> &,const _Elem *)' : could not deduce template argument for 'const std::basic_string<_Elem,_Traits,_Alloc> &' from 'int'
        c:\program files\microsoft visual studio 9.0\vc\include\string(150) : see declaration of 'std::operator <'
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(85) : error C2784: 'bool std::operator <(const _Elem *,const std::basic_string<_Elem,_Traits,_Alloc> &)' : could not deduce template argument for 'const _Elem *' from 'int'
        c:\program files\microsoft visual studio 9.0\vc\include\string(140) : see declaration of 'std::operator <'
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(85) : error C2784: 'bool std::operator <(const std::basic_string<_Elem,_Traits,_Alloc> &,const std::basic_string<_Elem,_Traits,_Alloc> &)' : could not deduce template argument for 'const std::basic_string<_Elem,_Traits,_Alloc> &' from 'int'
        c:\program files\microsoft visual studio 9.0\vc\include\string(130) : see declaration of 'std::operator <'
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(85) : error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'int'
        c:\program files\microsoft visual studio 9.0\vc\include\xutility(2262) : see declaration of 'std::operator <'
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(85) : error C2784: 'bool std::operator <(const std::_Revranit<_RanIt,_Base> &,const std::_Revranit<_RanIt2,_Base2> &)' : could not deduce template argument for 'const std::_Revranit<_RanIt,_Base> &' from 'int'
        c:\program files\microsoft visual studio 9.0\vc\include\xutility(2072) : see declaration of 'std::operator <'
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(85) : error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'int'
        c:\program files\microsoft visual studio 9.0\vc\include\utility(99) : see declaration of 'std::operator <'
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(85) : error C2677: binary '<' : no global operator found which takes type 'std::string' (or there is no acceptable conversion)
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(90) : error C2440: 'initializing' : cannot convert from 'char' to 'std::basic_string<_Elem,_Traits,_Ax>'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>,
            _Ax=std::allocator<char>
        ]
        No constructor could take the source type, or constructor overload resolution was ambiguous
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(97) : error C2275: 'std::string' : illegal use of this type as an expression
        c:\program files\microsoft visual studio 9.0\vc\include\xstring(2210) : see declaration of 'std::string'
c:\documents and settings\dad\my documents\visual studio 2008\projects\chapter 8.1 question 5\chapter 8.1 question 5\chapter 8.1 question 5.cpp(97) : error C2146: syntax error : missing ';' before identifier 'months'
#include "stdafx.h"
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
 
void dualSort(double [], string [], int);
void showArray(double[], string [], int);
 
 
int main()
{	
    int size[12];
	string months[size] = {"January", "February", "March", "April", "May","June","July","August", 
		                 "September", "October", "November", "December"};
	double rain[12];
	double total = 0;
	double average;
	double min = 0;
	double max = 0;
	
	
	for (int i = 0; i <=11; i++)
	{
		
		cout << "Enter the amount of rainfall in " << months[i] << ": ";
		cin >> rain[i];
		while (rain[i] < 0)
		{
			cout << "Cannot have negative rainfall! Please enter again:";
			cin >> rain[i];
		}
	}
	for(int i = 0; i <= 11; i++)
	{
		total = total + rain[i];
	}
	
	average = total / 12;
	
	min = rain[0];
	for(int i = 1; i < 12; i++)
	{
		if(rain[i] < min)
			min = rain[i];
	}
	
	max = rain[0];
	for(int i = 1; i < 12; i++)
	{
		if(rain[i] > max)
			max = rain[i];
	}
	cout << "Total Rainfall: " << total << endl;
	cout << "Average Rainfall: " << average << endl;
	cout << "The lowest monthly rainfall is " << min << endl;
	cout << "The highest monthly rainfall is " << max << endl;
 
    cout << "\tThe unsorted string is: \n";
	showArray(rain, months, 12);
	dualSort(rain, months, 12);
	cout << "\n\tThe sorted string is: \n";
	showArray(rain, months, 12);
	
   	
 
    system ("pause");
	return 0;
}
 
 
void dualSort(double rain[], string months[], int size)
{
	int startScan, maxIndex, strMonths;
	double maxValue;
	string months = months;
	for(startScan = 0; startScan < (size - 1); startScan++);
	{
		maxIndex = startScan;
		maxValue = rain[startScan];
		string months = months[startScan];
		for(int index = startScan + 1; index < months; index++)
		{
			if(rain[index] < maxValue)
			{
				maxValue = rain[index];
				string months = months[index];
				maxIndex = index;
			}
		}
		rain[maxIndex] = rain[startScan];
		months[maxIndex] = months[startScan];
		rain[startScan] = maxValue;
		months[startScan] = string months;
	}
}
 
 
void showArray(double rain[], string months[], int size)
{
	for(int count = 0; count < size; count++)
		cout << count << ": " << rain[count] << endl;
}

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ASKER

I was following the book in this program for a dualSort function, but the errors were saying can not convert string to int, and when I changed it to const int size[12], can not convert char to string.
Basically the program is to display the month with the rainfall input from the user into descending order. My instructor told me to use a dualSort function for this. So I just followed the examples. Is this not a correct way to do this? Sorry I'm still learning c++.
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