String Conversion

[mHart]

Attempting to read in the file data which is a set of temperatures in a year. For my functions displayAvgTemp, displayLowestTemp, and displayHighestTemp I'm getting an error: no match for operator< in 'Print[x] < lowestTemp'
error: cannot convert 'std::string' to 'int' in assignment

Any ideas on how I can fix this?

#include <stdlib.h>
#include <iostream>
#include <string>
#include <iomanip>
#include <fstream>
#include <sstream>

using namespace std;

//Function Prototype\\

int mainMenu(int);
int menuOptionOne(int);
int menuOptionTwo(int);
void displayMonthlyTemp();
void displayAverageTemp();
void displayLowestTemp();
void displayHighestTemp();

///////////////////////////////////////////////////
//Name: display average temp
//Purpose: display the monthly temperature for all
//months in the year
//Parameters: ifstream, int,
//Returns: tempratures for the month
///////////////////////////////////////////////////
void displayAverageTemp()
{
    //variable delcaration
    string yearFile;                //user entered
    int year;
    ifstream fin;
    int userYear=0;
    fin.open("RocTemp.txt");
    string print[12];
    int result[12];
    int totalTemp;
    int avgTemp;
    int temp;

    //prompt user for year
    cout << "Enter year: ";
    cin >> year;

    //Validate yera
    while (!(year >=1940 and year <=2011) )
    {
        cout << "\tInvalid Option - Must be between 1940-2011" <<endl;
        cout << "Enter option: ";
        cin >> year;
    }

    while (!fin.eof())
    {
        fin>>yearFile;
        userYear=atoi(yearFile.c_str());
        if(year == userYear)
        {
            for(int x=0; x<12; x++)
            {
                fin>>print[x];
                istringstream(print[x]) >> result[x];
                totalTemp += result[x];
                avgTemp = (totalTemp/12);
            }
        }

    }
    cout << avgTemp;
}
///////////////////////////////////////////////////
//Name: lowestTemp
//Purpose: displays lowest temp of year
//Parameters:
//Returns: lowest temp
///////////////////////////////////////////////////
void displayLowestTemp()
{
    //variable delcaration
    string yearFile;                //user entered
    int year;
    ifstream fin;
    int userYear=0;
    fin.open("RocTemp.txt");
    string print[12];
    int lowestTemp = 999;


    //prompt user for year
    cout << "Enter year: ";
    cin >> year;

    //Validate yera
    while (!(year >=1940 and year <=2011) )
    {
        cout << "\tInvalid Option - Must be between 1940-2011" <<endl;
        cout << "Enter option: ";
        cin >> year;
    }

    while (!fin.eof())
    {
        fin>>yearFile;
        userYear=atoi(yearFile.c_str());
        if(year == userYear)
        {
            for(int x=0; x<12; x++)
            {
                fin>>print[x];
                if(print[x] < lowestTemp)
                {
                    lowestTemp = print[x];
                }
            }
        }

    }
    cout << lowestTemp;
}
///////////////////////////////////////////////////
//Name: highestTemp
//Purpose: displays highest temp of year
//Parameters:
//Returns: highest temp
///////////////////////////////////////////////////
void displayHighestTemp()
{
    //variable delcaration
    string yearFile;                //user entered
    int year;
    ifstream fin;
    int userYear=0;
    fin.open("RocTemp.txt");
    string print[12];
    int highestTemp = -999;


    //prompt user for year
    cout << "Enter year: ";
    cin >> year;

    //Validate yera
    while (!(year >=1940 and year <=2011) )
    {
        cout << "\tInvalid Option - Must be between 1940-2011" <<endl;
        cout << "Enter option: ";
        cin >> year;
    }

    while (!fin.eof())
    {
        fin>>yearFile;
        userYear=atoi(yearFile.c_str());
        if(year == userYear)
        {
            for(int x=0; x<12; x++)
            {
                fin>>print[x];
                if(print[x] > highestTemp)
                {
                    highestTemp = print[x];
                }
            }
        }

    }
    cout << highestTemp;
}

[TheIdeasMan]

@mHart

print is an array of string but you are comparing it to an int. Hence the error & the clear error message.

So print should be an array of int. Although I would have thought Temperatures should be double.

Also this:

//prompt user for year
    cout << "Enter year: ";
    cin >> year;


//Validate yera
    while (!(year >=1940 and year <=2011) )
    {
        cout << "\tInvalid Option - Must be between 1940-2011" <<endl;
        cout << "Enter option: ";
        cin >> year;
    }

Should be a function, because it appears 3 times in your code.

Hope all goes well.