Compilare: user.cpp: In function ‘void read()’: user.cpp:8: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:12: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void desf()’: user.cpp:21: warning: statement has no effect user.cpp:28: warning: statement has no effect user.cpp:35: warning: statement has no effect user.cpp:42: warning: statement has no effect user.cpp: In function ‘int main()’: user.cpp:63: warning: unused variable ‘i’