Compilare: user.c: In function ‘main’: user.c:12:25: warning: unused variable ‘a’ [-Wunused-variable] int c, n, i, j, x, y, a; ^ user.c:12:16: warning: unused variable ‘j’ [-Wunused-variable] int c, n, i, j, x, y, a; ^ user.c:13:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &c, &n); ^ user.c:15:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &x, &y); ^