Compilare: user.cpp: In function ‘int num()’: user.cpp:19:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir, 1, DIM1, fin); ^ user.cpp:28:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir, 1, DIM1, fin); ^ user.cpp: In function ‘int main()’: user.cpp:36:29: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir, 1, DIM1, fin); ^