Compilare: main.cpp: In function 'int main()': main.cpp:49:29: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] body[num][nr+1]=NULL; ^~~~ main.cpp:60:44: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] fis[num].chr[fis[num].numar+1]=NULL; ^~~~ main.cpp:21:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dir.in","r",stdin); ^ main.cpp:22:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dir.out","w",stdout); ^ main.cpp:52:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&x); ^ main.cpp:57:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&x); ^