Compilare: user.c: In function ‘main’: user.c:41:38: warning: unused variable ‘b’ [-Wunused-variable] int nrlin, nrcol, q, i, j, k, a, b, l1, l2, c1, c2; ^ user.c:41:35: warning: unused variable ‘a’ [-Wunused-variable] int nrlin, nrcol, q, i, j, k, a, b, l1, l2, c1, c2; ^ user.c:46:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d ", &nrlin, &nrcol, &q); ^ user.c:93:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &l1, &c1, &l2, &c2); ^