Compilare: user.cpp:105:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() { ^ user.cpp: In function ‘int main()’: user.cpp:111:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &n ); ^ user.cpp:115:57: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d", &type, &people, &weight ); ^