Compilare: user.cpp: In function ‘void delete_nod(nod*&, nod*&, int)’: user.cpp:53:18: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if (p->info = s) ^ user.cpp:62:17: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if (p->info = s) { ^ user.cpp:64:13: warning: converting to non-pointer type ‘int’ from NULL [-Wconversion-null] c->info = NULL; ^~~~ user.cpp: In function ‘int main()’: user.cpp:112:17: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result] system("Pause"); ^