I have been trying to write a c++ program for doing the addition of 2 matrices and this is the code i have written. But i keep having the error saying "Process returned -1073741819 (0xC0000005)" Can you please help me find my error?

```
int main()
{
float a[3][3],b[3][3],c[3][3];
int l,k;
cout<<"tell me the nr of lines in the vectors"<<endl;
cin>>l;
cout<<"tell me the nr of columns in the vectors"<<endl;
cin>>k;
for(int i=1;i<=l;i++){
for(int j=1;j<=k;j++){
cout<<"A["<<i<<"]"<<"["<<j<<"]= ";
cin>>a[i][j];
}
}
for(int i=1;i<=l;i++){
for(int j=1;j<=k;j++){
cout<<"B["<<i<<"]"<<"["<<j<<"]= ";
cin>>b[i][j];
}
}
for(int i=1; i<=l;i++){
for(int j=1;j<=k;i++){
c[i][j]=a[i][j]+b[i][j];
}
}
cout<<"the sum of matrices A & B is;"<<endl;
/* i have also added this code here instead of the following loop just to see if there was a problem with the addition procedure or displayin the results;
cout<<c[i][j]; */
for(int i=1;i<=l;i++){
for(int j=1;j<=k;j++){
cout<<c[i][j];
}
}
return 0;
}
```

asked on Stack Overflow Mar 23, 2020 by Eyup Yilmaz

In your sum logic, the nested iterator variable `j`

is not being incremented, it's `i`

.
Which looks like:

```
for(int i=1; i<=l;i++){
for(int j=1;j<=k;i++){ /*Change i to j*/
c[i][j]=a[i][j]+b[i][j];
}
}
```

So, it looks like:

```
for(int i=1; i<=l;i++){
for(int j=1;j<=k;j++){
c[i][j]=a[i][j]+b[i][j];
}
}
```

And the whole code becomes:

```
#include <iostream>
using namespace std;
int main()
{
float a[3][3], b[3][3], c[3][3];
int l, k;
cout << "tell me the nr of lines in the vectors" << endl;
cin >> l;
cout << "tell me the nr of columns in the vectors" << endl;
cin >> k;
for (int i = 0; i < l; i++)
{
for (int j = 0; j < k; j++)
{
cout << "A[" << i << "]"
<< "[" << j << "]= ";
cin >> a[i][j];
}
}
for (int i = 0; i < l; i++)
{
for (int j = 0; j < k; j++)
{
cout << "B[" << i << "]"
<< "[" << j << "]= ";
cin >> b[i][j];
}
}
for (int i = 0; i < l; i++)
{
for (int j = 0; j < k; j++)
{
c[i][j] = a[i][j] + b[i][j];
}
}
cout << "the sum of matrices A & B is;" << endl;
/* i have also added this code here instead of the following loop just to see if there was a problem with the addition procedure or displayin the results;
cout<<c[i][j]; */
for (int i = 0; i < l; i++)
{
for (int j = 0; j < k; j++)
{
cout << c[i][j];
}
}
return 0;
}
```

Final Output:

```
tell me the nr of lines in the vectors
2
tell me the nr of columns in the vectors
3
A[1][1]= 1
A[1][2]= 2
A[1][3]= 3
A[2][1]= 4
A[2][2]= 5
A[2][3]= 6
B[1][1]= 1
B[1][2]= 2
B[1][3]= 3
B[2][1]= 4
B[2][2]= 5
B[2][3]= 6
the sum of matrices A & B is;
24681012
Process finished with exit code 0
```

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