Struct Array result returns nan

[GameRez]

Hi,
I created a program for rainfall calculations. My result somehow for the total rainfall and the average is displaying nan for the results.

#include <iostream>
#include <string>
#include <iomanip>
#include <sstream>
#include <cstdlib>

using namespace std;

int i;
string input = "";

struct weather
{
double totRain;
double highTemp;
double lowTemp;
};

void readWeather(double &vRfall, double &vHtemp, double &vLtemp, int &i);
void calTotAvg(weather months[], double &vTotal, double &vAverage);
void calHighLow(weather months[], double &vhighest, int &vhighMon, double &vlowest, int &vlowMon);

int main()
{
cout << "---------------------- Weather Statistics --------------------------" << endl;
cout << " " << endl;

weather months[12];

double vRfall, vHtemp, vLtemp;

for (int i = 0; i < 12; i++)
{
readWeather(vRfall, vHtemp, vLtemp, i);

months[i].totRain = vRfall;
months[i].highTemp= vHtemp;
months[i].lowTemp = vLtemp;
}

double vTotal, vAverage;

calTotAvg ( months, vTotal, vAverage);

int vhighMon, vlowMon;
double vhighest, vlowest;

calHighLow ( months, vhighest, vhighMon, vlowest, vlowMon);

// Display total rainfall.
cout << " " << endl;
cout << " The total rainfall for the year : " << setw(3) << vTotal << endl;

// Display the average rainfall for the year
cout << " The average rainfall for the year : " << setw(3) << vAverage << endl;

// Display the highest temperature for the year
cout << " The highest temperature for the year : " << setw(3) << vhighest << " in month " << setw(2) << vhighMon << endl;

// Display the lowest temperature for the year
cout << " The lowest temperature for the year : " << setw(3) << vlowest << " in month " << setw(2) << vlowMon << endl;

return 0;
}



void readWeather(double &vRfall, double &vHtemp, double &vLtemp, int &i)
{
cout << " " << endl;

while (true)
{
cout << " Enter month " << setw(2) << (i+1) << " total rainfall : " ;
cin >> input;

if ( input.find_first_not_of("1234567890.") != string::npos )
{
cout << " * Invalid input, please try again" << '\a' << endl;
}
else
{
stringstream myStream(input);
if (myStream >> vRfall)
break;
}
}

while (true)
{
cout << " Enter month " << setw(2) << (i+1) << " high temperature : " ;
cin >> input;

if ( input.find_first_not_of("1234567890.") != string::npos )
{
cout << " * Invalid input, please try again" << '\a' << endl;
}
else
{
stringstream myStream(input);
if (myStream >> vHtemp)
break;
}
}
while (true)
{
cout << " Enter month " << setw(2) << (i+1) << " low temperature : " ;
cin >> input;

if ( input.find_first_not_of("1234567890.") != string::npos )
{
cout << " * Invalid input, please try again" << '\a' << endl;
}
else
{
stringstream myStream(input);
if (myStream >> vLtemp)
break;
}
}
}

void calTotAvg(weather months[], double &vTotal, double &vAverage)
{
for (int x = 0; x < 12; x++)
{
vTotal += months[x].totRain ;
}

vAverage = vTotal / 12;
}

void calHighLow(weather months[], double &vhighest, int &vhighMon, double &vlowest, int &vlowMon)
{
vhighest = months[0].highTemp;
for (int x = 0; x < 12; x++)
{
if (months[x].highTemp >= vhighest )
{
vhighest = months[x].highTemp;
vhighMon = x+1;
}
}

vlowest = months[0].lowTemp;
for (int y = 0; y < 12; y++)
{
if (months[y].lowTemp <= vlowest )
{
vlowest = months[y].lowTemp;
vlowMon = y+1;
}
}

}

[shadowCODE]

use code tags.

#include <iostream>
#include <string>
#include <iomanip>
#include <sstream>
#include <cstdlib>

using namespace std;

int i;
string input = "";

struct weather
{
double totRain;
double highTemp;
double lowTemp;
};

void readWeather(double &vRfall, double &vHtemp, double &vLtemp, int &i);
void calTotAvg(weather months[], double &vTotal, double &vAverage);
void calHighLow(weather months[], double &vhighest, int &vhighMon, double &vlowest, int &vlowMon);

int main()
{
cout << "---------------------- Weather Statistics --------------------------" << endl;
cout << " " << endl;

weather months[12];

double vRfall, vHtemp, vLtemp;

for (int i = 0; i < 12; i++)
{
readWeather(vRfall, vHtemp, vLtemp, i);

months[i].totRain = vRfall;
months[i].highTemp= vHtemp;
months[i].lowTemp = vLtemp;
}

double vTotal, vAverage;

calTotAvg ( months, vTotal, vAverage);

int vhighMon, vlowMon;
double vhighest, vlowest;

calHighLow ( months, vhighest, vhighMon, vlowest, vlowMon);

// Display total rainfall.
cout << " " << endl;
cout << " The total rainfall for the year : " << setw(3) << vTotal << endl;

// Display the average rainfall for the year
cout << " The average rainfall for the year : " << setw(3) << vAverage << endl;

// Display the highest temperature for the year
cout << " The highest temperature for the year : " << setw(3) << vhighest << " in month " << setw(2) << vhighMon << endl;

// Display the lowest temperature for the year
cout << " The lowest temperature for the year : " << setw(3) << vlowest << " in month " << setw(2) << vlowMon << endl;

return 0;
}



void readWeather(double &vRfall, double &vHtemp, double &vLtemp, int &i)
{
cout << " " << endl;

while (true)
{
cout << " Enter month " << setw(2) << (i+1) << " total rainfall : " ;
cin >> input;

if ( input.find_first_not_of("1234567890.") != string::npos )
{
cout << " * Invalid input, please try again" << '\a' << endl;
}
else
{
stringstream myStream(input);
if (myStream >> vRfall)
break;
}
}

while (true)
{
cout << " Enter month " << setw(2) << (i+1) << " high temperature : " ;
cin >> input;

if ( input.find_first_not_of("1234567890.") != string::npos )
{
cout << " * Invalid input, please try again" << '\a' << endl;
}
else
{
stringstream myStream(input);
if (myStream >> vHtemp)
break;
}
}
while (true)
{
cout << " Enter month " << setw(2) << (i+1) << " low temperature : " ;
cin >> input;

if ( input.find_first_not_of("1234567890.") != string::npos )
{
cout << " * Invalid input, please try again" << '\a' << endl;
}
else
{
stringstream myStream(input);
if (myStream >> vLtemp)
break;
}
}
}

void calTotAvg(weather months[], double &vTotal, double &vAverage)
{
for (int x = 0; x < 12; x++)
{
vTotal += months[x].totRain ;
}

vAverage = vTotal / 12;
}

void calHighLow(weather months[], double &vhighest, int &vhighMon, double &vlowest, int &vlowMon)
{
vhighest = months[0].highTemp;
for (int x = 0; x < 12; x++)
{
if (months[x].highTemp >= vhighest )
{
vhighest = months[x].highTemp;
vhighMon = x+1;
}
}

vlowest = months[0].lowTemp;
for (int y = 0; y < 12; y++)
{
if (months[y].lowTemp <= vlowest )
{
vlowest = months[y].lowTemp;
vlowMon = y+1;
}
}

}

[PCrumley48]

Your problem is in line 40. . . what values will be passed to your functions by uninitialized variables?