Returning array from one function to another

[g0ldt1g3r]

When trying to move the arrays average and total from double calc to int main they both lose whatever data is stored in them and I am unable to figure out why. Any help is appreciated.

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

using namespace std;

int runners (double mpd[5][7],string name[5]);
double calc(double mpd[5][7]);

int main()
{
    double mpd[5][7],total[5],average[5];
    string name[5];
    int x,y;
    runners(mpd,name);
    calc(mpd);

    for (y = 0; y < 5; y++){
        cout << name[y] << "  ";
        for (x = 0; x < 7; x++){
          cout << mpd[y][x] << "  ";
        }
        cout << " Total............" << total[y] << " Average:............" << average[y];
        cout << "\n";
    }

    return 0;
}


int runners (double mpd[5][7],string name[5]){
    ifstream inFile;
    string input[5][8];
    int x,y;

    inFile.open("Marathon.txt");
    cout<<"Gathering input data..."<<endl;

    for (y = 0; y < 5; y++){
        for(x = 0; x < 8; x++){
            inFile >> input[y][x];
        }
    }

    for (y = 0; y < 5; y++){
        name[y] = input [y][0];
    }

    for (y = 0; y < 5; y++){
        for(x = 0; x < 8; x++){
            stringstream sso;
            sso << input[y][x];
            if (x > 0){
                sso >> mpd[y][x-1];
            }
        }
    }
    inFile.close();


    return &mpd and &name;
}

double calc(double mpd[5][7]){
    double sum,total[5],average[5];
    int x,y;
        for (y = 0; y < 5; y++){
            cout << fixed << showpoint << setprecision(1);
            sum = 0;
            for (x = 0; x < 7; x++){
                sum = sum + mpd[y][x];
        }
                average[y] = sum/7;
                total[y] = sum;
    }
    for (y = 0; y < 5; y++){
                cout << "ave" << average[y];
                cout << "       Total: " << total[y] << " \n";
    }


    return &average and &total;
}

[ne555]

> return &mpd and &name;
> return &average and &total;
it doesn't work that way.

When you write

double //return type
calc //function name
( //parameters
   double mpd[5][7]
);

you are saying that your functions return a double, just one number.


You are also confused by scope. `average' and `total' in `calc()' are not the same variables that `average' and `total' in `main()'.
What you may do is pass the arrays to the function, as you are doing with `mpd' and `name'

void //there is no need to return anything
calc(
   double mpd[5][7],
   double total[5],
   double average[5]
);

[g0ldt1g3r]

Thanks, I feel a little stupid now for such an easy fix.