Visit All 4 Adjacent Cells using C++

#include <bits/stdc++.h>
using namespace std;

void printArray(char a[3][3]) {
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++)
            printf("%c ", a[i][j]);
        printf("\n");
    }
    printf("\n");
}

int main() {

    int x[4] = {1, 0, -1, 0};
    int y[4] = {0, 1, 0, -1};
    char a[3][3];
    for (int i = 0; i < 3; i++)
        for (int j = 0; j < 3; j++)
            a[i][j] = '.';
    // (1, 1) -> center of the 3x3 cell
    for (int i = 0; i < 4; i++) {
        int R = (1 + x[i]);
        int C = (1 + y[i]);
        if (R >= 0 && R < 3 && C >= 0 && C < 3) a[R][C] = '*';
        printArray(a);
    }

    return 0;
}