2d array addition in c++

Question

i am trying to add two 2D arrays in C++ with my following code by i am getting output as this 333 333, but i want out as 2 rows

    { 
        int a[2][3], b[2][3], i , j;

        cout<<"First Matrix"<<endl;
    for (int i=0; i<2; i++)
    {
        for (int j=0; j<3; j++)
        {
    cin>>a[i] [j];
        }
    }
    cout<<"Second Matrix"<<endl;
            for(int i=0; i<2; i++)
    {
        for (int j=0; j<3; j++)
        {
        cin>>b[i][j];
        }
    }
    for (int i=0; i<2; i++)
    {
        for (int j=0; j<3; j++)
        {
            cout<<a[i] [j] + b[i] [j];
        }
        cout<<"    ";
    }
    cout<<endl;

    _getch();
    }

Every time to print the output, you need to tell the compiler that it is done executing one line and therefore needs to move to the next line. This will avoid over writing on the same line. So you just add <<endl; like cout<<a[i][j] + b[i][j]<<endl; — Juniar
– Juniar, Commented Jul 20, 2014 at 0:40

score 2 · Accepted Answer · 2014-07-19 16:42:51Z

2

Last for loop is wrong. You have to move cout's.

for (int i=0; i<2; i++)
    {
        for (int j=0; j<3; j++)
        {
            cout<<a[i] [j] + b[i] [j];
            cout<<"    ";
        }
        cout<<endl;
    }

Also your variables i and j are unused because you are declaring new ones in for loops with int i=0; and int j=0;.

edited Jul 19, 2014 at 16:42

answered Jul 19, 2014 at 16:37

user3478972

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Comments

Joseph Mansfield · Accepted Answer · 2014-07-19 16:32:29Z

1

How about changing the line that prints spaces to print a newline?

cout<<"    ";

becomes

cout<<"\n";

answered Jul 19, 2014 at 16:32

Joseph Mansfield

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Comments

aruisdante · Accepted Answer · 2014-07-19 16:32:38Z

0

You don't put any newlines in your code, so of course it won't print out on a new line. replace cout<<" "; with cout<<std::endl; and you should get each row on a new line.

answered Jul 19, 2014 at 16:32

aruisdante

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Comments

Guilherme · Accepted Answer · 2014-07-19 16:38:15Z

0

Replace the last piece of code by this:

for (int i=0; i<2; i++)
{
    for (int j=0; j<3; j++)
    {
        cout<<a[i] [j] + b[i] [j] << ' ';
    }
    cout<< "\n";
}
cout << "\n";

answered Jul 19, 2014 at 16:38

Guilherme

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