Compilare: main.c: In function 'main': main.c:4:23: warning: unused variable 'r' [-Wunused-variable] long int t, a, b, r; ^ main.c:7:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%ld", &t); ^~~~~~~~~~~~~~~~~~~~~ main.c:9:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%ld%ld", &a, &b); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~