loop and array problem for beginner. Please HELP!

[sweet++]

The code below is a program to input and print a number of books sold for three years. I'm not able to print the sum of books sold for each year, but I can print the total number of books sold for the 3years. I'm a beginner. I need help to enable continue my reading.
I will appreciate if you can throw more lights on array that could be or help.
Thanks

#include <iostream>
#include <string>

int main()
{
using namespace std;
int counter1 = 2000;
int SumSold[3][12];
int NumSold[3];
string months[3][12] =
{

{
"January", "February", "March", "April", "May", "June", "July",
"August", "September", "October", "November", "December"
},
{
"January", "February", "March", "April", "May", "June", "July",
"August", "September", "October", "November", "December"
},
{
"January", "February", "March", "April", "May", "June", "July",
"August", "September", "October", "November", "December"
}
};

cout << "NO. OF BOOKS SOLD FROM 2001 - 2003 " << endl << endl;
for(int i = 0; i < 3; ++i)
{
++counter1;
cout << "YEAR " << counter1 << endl;
for(int ix = 0; ix < 12; ++ix)
{
cout << "Books sold in " << months[i][ix] << ": ";
cin >> NumSold[ix];
SumSold[i][ix] = SumSold[i][ix] + NumSold[ix];
}
}

for(int iv = 0; iv < 3; ++iv)
{
for(int inval = 0; inval = 12; ++inval)
{
cout << SumSold[iv][inval] << endl;
}
}
return 0;
}

[Lindley]

It doesn't seem terribly useful to duplicate the months 3 times like that. It's not like they're about to change or anything.

[sweet++]

Good point sir. Thanks alot

[Lindley]

You need to initialize your numeric arrays to contain 0s. You seem to be assuming they will for now, but that's not guaranteed. Just adding "= {0};" after the declaration should do it.

[sweet++]

Another important point.
Thanks.
Is it possible to add an array(1 or 2D) to an integer and assign the result to an integer?

[Lindley]

You mean sum up the values in the array? You could use std::accumulate, but for a beginner it's probably best to just use a loop. That's what accumulate() is doing internally anyway.

[sweet++]

Thank you sir!

[MDScpp]

Im just interested to know why you used "endl" twice in the 'number of books sold from 2001-2003 bit, or is that just a mistake. Sorry Im a total noob at C++.