Compilare: user.cpp: In function ‘int main()’: user.cpp:61:17: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] a[0]=NULL; ^ user.cpp: In function ‘char* censor(char*, char*, char*, char*)’: user.cpp:99:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(short i=1;i<strlen(p);i++) ^ user.cpp:116:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<strlen(p);i++) ^ user.cpp:118:18: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] p2[i]=NULL; ^ user.cpp:90:21: warning: address of local variable ‘new_str’ returned [-Wreturn-local-addr] char *p=str,*p2,new_str[200],sep[]=" "; ^