Compilare: user.cpp: In function ‘int query(int, int, int, int, int)’: user.cpp:66:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int read()’: user.cpp:98:66: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (cnt == siz) fgets(buf,65536,fi),siz = strlen(buf),cnt = 0; ^ user.cpp:101:66: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (cnt == siz) fgets(buf,65536,fi),siz = strlen(buf),cnt = 0; ^ user.cpp: In function ‘int main()’: user.cpp:109:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("eliminare.out","w",stdout); ^ user.cpp:110:24: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(buf,65536,fi); ^