📅 Date: Jan 14, 2026
🔥 Topic: 2D Arrays Input & Matrix Addition

🔄 The Nested Loop

To travel through a 2D Array, we need two pointers:
i = Controls the Row.
j = Controls the Column.

💻 Day 14 Code: Adding Two Matrices

Today I built a program that takes two 2x2 matrices and adds them together. 

#include <iostream>
using namespace std;

int main() {
    int A[2][2] = {{1, 2}, {3, 4}};
    int B[2][2] = {{5, 6}, {7, 8}};
    int Sum[2][2];

    cout << "Sum Matrix:" << endl;

    // Outer Loop (Rows)
    for(int i=0; i<2; i++) {
        // Inner Loop (Cols)
        for(int j=0; j<2; j++) {
            
            Sum[i][j] = A[i][j] + B[i][j];
            
            cout << Sum[i][j] << " ";
        }
        cout << endl; // New line after every row
    }

    return 0;
}

💭 Thoughts

Nested loops can be confusing at first. The inner loop runs completely for every single step of the outer loop. This is crucial for image processing and game grids.