Explain how this works→

Question

#include <iostream>
using namespace std;

int main() {
int arr3[2][3][3]={
{ {5,6,2},{3,4,4},{2,7,5}},
{ {5,7,6},{7,8,1},{1,2,6}}
};
int i=0,j;
for(j=0;j<2;j++){
i += arr3[j][j][j];
}cout << i;
return 0;
}

why 'i' value is 13?
........i know!!

Answer 1

arr3[0][0][0] and arr3[1][1][1] was added to i, i is printed. (5 + 8) = 13.

Answer 2

#include <iostream>
using namespace std;

int main() {
int arr3[2][3][3]={
{ {5,6,2},{3,4,4},{2,7,5}},
{ {5,7,6},{7,8,1},{1,2,6}}
};
int i=0,j;
for(j=0;j<2;j++){
i += arr3[j][j][j];
cout << "arr3[" << j << "][" << j << "][" << j << "]=" << arr3[j][j][j] << endl;
}cout << "summa ="<< i;
return 0;
}

//why you get 13 as the answer?

Answer 3

@Konstantin
i think you meant "sum" not "summa"

Answer 4

Yes. )