Compilare: user.cpp: In function ‘int main()’: user.cpp:46: warning: unused variable ‘n’ user.cpp:46: warning: unused variable ‘c’ user.cpp:53: warning: unused variable ‘h’ user.cpp:54: warning: unused variable ‘ih’ user.cpp:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:56: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:64: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result