Compilare: main.c: In function 'main': main.c:28:22: warning: unused variable 'l' [-Wunused-variable] int k, m, n, i, j, l; ^ main.c:28:19: warning: unused variable 'j' [-Wunused-variable] int k, m, n, i, j, l; ^ main.c:28:16: warning: unused variable 'i' [-Wunused-variable] int k, m, n, i, j, l; ^ main.c:30:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d", &k, &n, &m ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~