Compilare: main.cpp: In function 'int main()': main.cpp:85:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xortransform.out","w",stdout); ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:40:29: 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, 4096, fin); ^ main.cpp: In function 'int main()': main.cpp:99:27: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized] x[calc(i,j)]^=a; ^