File: 14_16.c

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#define X_SIZE 60
#define Y_SIZE 30

int matrix[X_SIZE][Y_SIZE];

void init_matrix(void)
{
    register int index;         /* element counter */
    register int *matrix_ptr;

    matrix_ptr = &matrix[0][0];
    for (index = 0; index < X_SIZE * Y_SIZE; index++) {
        *matrix_ptr = -1;
        matrix_ptr++;
    }
}