Compilare: user.c: In function ‘main’: user.c:6:34: warning: unused variable ‘r’ [-Wunused-variable] int nrlin, nrcol, i, j, ans, r; ^ user.c:6:26: warning: unused variable ‘j’ [-Wunused-variable] int nrlin, nrcol, i, j, ans, r; ^ user.c:6:23: warning: unused variable ‘i’ [-Wunused-variable] int nrlin, nrcol, i, j, ans, r; ^ user.c:10:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d ", &nrlin, &nrcol); ^