chess table

#include <stdio.h>

const int TABLE_SIZE = 8;

int main() {
    printf("Size of the table: ");
    int unit;
    scanf("%d", &unit);

    const int real_size = unit * TABLE_SIZE;
    const int modulus = unit * 2;

    for (int row = 0; row < real_size; ++row) {
        for (int column = 0; column < real_size; ++column)
            if ((row % modulus < unit) ^ (column % modulus < unit))
                printf(".");
            else
                printf("X");

        printf("\n");
    }

    return 0;
}