Compilare: user.cpp: In function ‘int calc(int, int)’: user.cpp:59:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int bfs(int, int)’: user.cpp:80:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘char nextch()’: user.cpp:8:29: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,1,MAXBUF,fi); ^