Compilare: user.c: In function ‘main’: user.c:19:5: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] fprintf(file2, "%llf %llf", wf, wf * hp / wp); ^ user.c:19:5: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] user.c:6:29: warning: unused variable ‘hpn’ [-Wunused-variable] double wf, hf, wp, hp, wpn, hpn; ^ user.c:6:24: warning: unused variable ‘wpn’ [-Wunused-variable] double wf, hf, wp, hp, wpn, hpn; ^ user.c:11:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lf", &wf); ^ user.c:12:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lf", &hf); ^ user.c:13:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lf", &wp); ^ user.c:14:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lf", &hp); ^