2-D array addition

Could someone give me a bit of advice on how to add the contents of a 2D array? I am working from a book and one of the exercises ask you to enter book sales for a 3 year period. Then it aska you to calculate the total for each year then the total for all the years. I can get the total for all the years but for the life of me i can't get the total for each individual year. I do a nested loop but it keeps adding all the arrays. I will put the code here:

// 2D_array_for_3_years.cpp -- storing 3 years of book sales in a 2D array
#include <iostream>

const int YEARS = 3;
const int MONTHS = 12;
int books[YEARS][MONTHS];

using std::cout;
using std::cin;
using std::endl;

int main(void)
{
cout << "Enter each monthly value of books for a 3 year period.\n\n";

int individual = 0;
int combined = 0;
int year, month;

for ( year = 1; year <= YEARS; year++ )
{
cout << "Year #" << year << ": " << endl;
for ( month = 0; month < MONTHS; month++ )
cin >> books[year][month];
cout << endl;
}

// output each individual years total



for ( year = 0; year <= YEARS; year++ )
for ( month = 0; month < MONTHS; month++ )
combined += books[year][month];
cout << "The combined total for all three years is: " << char ( -100 );
cout << combined;



return 0;
}

i just want someone to point me in the right direction if at all possible. Thanks in advance

Paul820

I don't see any code that attempts to total individual years. but the pseudocode would be:

Thanks a lot ubergeek, i have been banging my head for about 3 hours trying to get it to work. You're right the code wasn't there because it ended up doing the same as the total for all the years. I just posted the code so people would get a better understanding of what i wanted.

Anyway, followed your advice :

// output each individual years total
int y, m;
for ( y = 1; y <= YEARS; y++ )
{
int individual = 0;
for ( m = 0; m < MONTHS; m++ )
individual += books[y][m];
cout << "Year #" << y << " : ";
cout << individual << endl;

The way i was doing it, it was cycling through the whole lot. Thanks for the really fast reply, appreciate that.

Paul820