Compilare: user.cpp: In function ‘int main()’: user.cpp:136:13: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k; ^ user.cpp: In function ‘char getChar(FILE*)’: user.cpp:67:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, MAX_BUFF, f); ^ user.cpp: In function ‘int main()’: user.cpp:186:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("control.out", "w", stdout); ^