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C++: Flattening a 2d array into a 1d array

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0

$begingroup$

I started learning c++ and have a problem with one of my starting exercises.

The exercise involves a regular flattening of some kind: in a function, I need to sum the values of every column in every row of a 2d input array and then return the sum calculated for each row in a newly created 1d array.

I filled a 2d array with randomly generated integers:

int expenses[7][10];



for (int i = 0; i < 7; i++)

{

    for (int j = 0; j < 10; j++)

    {

        expenses[i][j] = rand();

        std::cout << expenses[i][j] << " ";         

    }

    std::cout << " n";

}

So far, with the help of this article, I have the following function:

int* sumOfDays(int input[7][10])

{

    static int res[7];



    for (int i = 0; i < 7; i++)

    {

        for (int j = 0; j < 10; j++)

        {

            res[i] += *input[i, j];

        }

    }

    return res;

}

which I would like to send to the standard output like this:

std::cout << "the sum of days is: " << "n";



int* r = sumOfDays(expenses);

for (int i = 0; i < 7; i++)

{

    std::cout << i+1 << ". " << *(r + i) << "n";

}

However, I get the following output:

What am I missing? I'm sure it is a rooky mistake, but I just can't seem to figure it out.

c++ array

share

asked 6 mins ago

rTECHrTECH

1814

$endgroup$

add a comment | 

0

$begingroup$

I started learning c++ and have a problem with one of my starting exercises.

The exercise involves a regular flattening of some kind: in a function, I need to sum the values of every column in every row of a 2d input array and then return the sum calculated for each row in a newly created 1d array.

I filled a 2d array with randomly generated integers:

int expenses[7][10];



for (int i = 0; i < 7; i++)

{

    for (int j = 0; j < 10; j++)

    {

        expenses[i][j] = rand();

        std::cout << expenses[i][j] << " ";         

    }

    std::cout << " n";

}

So far, with the help of this article, I have the following function:

int* sumOfDays(int input[7][10])

{

    static int res[7];



    for (int i = 0; i < 7; i++)

    {

        for (int j = 0; j < 10; j++)

        {

            res[i] += *input[i, j];

        }

    }

    return res;

}

which I would like to send to the standard output like this:

std::cout << "the sum of days is: " << "n";



int* r = sumOfDays(expenses);

for (int i = 0; i < 7; i++)

{

    std::cout << i+1 << ". " << *(r + i) << "n";

}

However, I get the following output:

What am I missing? I'm sure it is a rooky mistake, but I just can't seem to figure it out.

c++ array

share

asked 6 mins ago

rTECHrTECH

1814

$endgroup$

add a comment | 

$begingroup$

I started learning c++ and have a problem with one of my starting exercises.

The exercise involves a regular flattening of some kind: in a function, I need to sum the values of every column in every row of a 2d input array and then return the sum calculated for each row in a newly created 1d array.

I filled a 2d array with randomly generated integers:

int expenses[7][10];



for (int i = 0; i < 7; i++)

{

    for (int j = 0; j < 10; j++)

    {

        expenses[i][j] = rand();

        std::cout << expenses[i][j] << " ";         

    }

    std::cout << " n";

}

So far, with the help of this article, I have the following function:

int* sumOfDays(int input[7][10])

{

    static int res[7];



    for (int i = 0; i < 7; i++)

    {

        for (int j = 0; j < 10; j++)

        {

            res[i] += *input[i, j];

        }

    }

    return res;

}

which I would like to send to the standard output like this:

std::cout << "the sum of days is: " << "n";



int* r = sumOfDays(expenses);

for (int i = 0; i < 7; i++)

{

    std::cout << i+1 << ". " << *(r + i) << "n";

}

However, I get the following output:

What am I missing? I'm sure it is a rooky mistake, but I just can't seem to figure it out.

c++ array

share

asked 6 mins ago

rTECHrTECH

1814

$endgroup$

int expenses[7][10];



for (int i = 0; i < 7; i++)

{

    for (int j = 0; j < 10; j++)

    {

        expenses[i][j] = rand();

        std::cout << expenses[i][j] << " ";         

    }

    std::cout << " n";

}

int* sumOfDays(int input[7][10])

{

    static int res[7];



    for (int i = 0; i < 7; i++)

    {

        for (int j = 0; j < 10; j++)

        {

            res[i] += *input[i, j];

        }

    }

    return res;

}

std::cout << "the sum of days is: " << "n";



int* r = sumOfDays(expenses);

for (int i = 0; i < 7; i++)

{

    std::cout << i+1 << ". " << *(r + i) << "n";

}

share

asked 6 mins ago

rTECHrTECH

1814

share

asked 6 mins ago

rTECHrTECH

1814

asked 6 mins ago

rTECHrTECH

1814

asked 6 mins ago

rTECHrTECH

1814