HOW DO I MAKE THIS PROGRAM WORK?

[tariqles]

#include <iostream>
using namespace std;

double getTemps();
double calcAvg(double temp1, double temp2, double temp3);
void displayAvg(double avg);


int main()
{
//getTemps();
calcAvg(getTemps());
displayAvg( calcAvg(temp1,temp2,temp3));


return 0;
}
double getTemps()
{
double temp1, temp2, temp3;
cout << "Enter tempertature of 3 cities" << endl;
cin >> temp1,
temp2,
temp3;
return temp1, temp2, temp3;
}
double calcAvg(double temp1, double temp2, double temp3)
{
double avg;
avg = (temp1 + temp2 + temp3) / 3;
return avg;
}
void displayAvg(double avg)
{
cout << "The average temperature is " << avg << "degrees" << endl;
}

[Chervil]

This doesn't work:

double getTemps()
{
    double temp1, temp2, temp3;
    cout << "Enter tempertature of 3 cities" << endl;
    cin >> temp1,
    temp2,
    temp3;
    return temp1, temp2, temp3;
}

The cin statement is incorrect:

    cin >> temp1,
    temp2,
    temp3;

it should be:

    cin >> temp1
        >> temp2
        >> temp3;

The function returns a single value of type double. If you want to return multiple values there are several possible methods. One is to pass by reference.

void getTemps(double& temp1, double& temp2, double& temp3)
{
    cout << "Enter temperature of 3 cities" << endl;
    cin >> temp1 >> temp2 >> temp3;
}

See tutorial on functions:
http://www.cplusplus.com/doc/tutorial/functions/
and the comma operator:
http://www.cplusplus.com/doc/tutorial/operators/


Edit: Then main() might look like this:

int main()
{
    double temp1, temp2, temp3;
    
    getTemps(temp1, temp2, temp3);

    double average = calcAvg(temp1,temp2,temp3);

    displayAvg( average );
}

or perhaps like this:

int main()
{
    double temp1, temp2, temp3;
    
    getTemps(temp1, temp2, temp3);

    displayAvg( calcAvg(temp1,temp2,temp3) );
}

[jonnin]

screams object to me.

struct tmps
{
double tmp1, tmp2, tmp3;
void getTemps() {cout << "words\n"; cin >> tmp1 >> tmp2 >> tmp3;}
};

...
tmps t; //declare an instance of your custom variable type which contains the temps here.
t.getTemps();

use(t.tmp2); //access them like this.
cout << t.tmp1;