Compilare: user.c: In function ‘main’: user.c:15:24: warning: unused variable ‘d’ [-Wunused-variable] int n, m, i, j, k, d; ^ user.c:17:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &n, &m ); ^ user.c:21:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &mat[i][j] ); ^