Compilare: user.cpp: In function ‘void structura()’: user.cpp:40:7: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] *p=NULL; ^ user.cpp: In function ‘void fisier()’: user.cpp:68:14: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] nf[i-poz]=NULL; ^ user.cpp: In function ‘void sortare()’: user.cpp:80:9: warning: unused variable ‘i’ [-Wunused-variable] int i, ok; ^ user.cpp: In function ‘int main()’: user.cpp:23:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%s",s); ^