Compilare: main.cpp: In function 'int main()': main.cpp:79:45: warning: NULL used in arithmetic [-Wpointer-arith] while(!(is_sign(eq[i]))&&eq[i]!=NULL) ^~~~ main.cpp:98:17: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] eq[n+1]=NULL; ^~~~ main.cpp: In function 'int which_term(char)': main.cpp:25:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int pzt(char)': main.cpp:33:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int how_many_val(long long int*, int, int, long long int)': main.cpp:64:1: warning: control reaches end of non-void function [-Wreturn-type] } ^