Language: C++

#include<iostream>
#include<memory>
using namespace std;

struct list{
	int num;
	list *left, *right;
};

list *nill;

list *tnew(void);
void insert(int);
void init(void);
void deleteList(list *dl);
list *seachList(int);
void deleteFirst(void);
void deleteLast(void);

int main(void){
	char c[50];
	int n;
	int s;
   	cin >> &s;
	while(s){
		cin >> c;
		if(c[0] == 'i'){
			cin >> n;
			insert(n);
		}
		else if(c[0] == 'd' && sizeof(c)/sizeof(char) == 6){
			cin >> n;
			deleteList(seachList(n));
		}
		else if(c[6] == 'F'){
			deleteFirst();
		}
		else{
			deleteLast();
		}
	}
	list *y = nill->right;
	while(y != nill){
		cout << y->num << ' ';
		y = y->right;
	}
	cout << endl;
	return 0;
}

list *tnew(void){
	return new list;
}

void insert(int nu){
	list *p;
	p = tnew();
	p->num = nu;

	p->right = nill->right;
	nill->right->left = p;
	nill->right = p;
	p->left = nill;
}

void init(void){
	nill = tnew();
	nill->right = nill;
	nill->left = nill; 
}

list *seachList(int sl){
	list *x = nill->right;
	while(x != nill && x->num != sl){
		x = x->right;
	}
	return x;
}

void deleteList(list *dl){
	dl->left->right = dl->right;
	dl->right->left = dl->left;
	delete dl;
}

void deleteFirst(void){
	deleteList(nill->right);
}

void deleteLast(void){
	deleteList(nill->left);
}



Compiler output:
a.cc: In function 'int main()':
a.cc:24:13: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'int*')
   24 |         cin >> &s;
      |         ~~~ ^~ ~~
      |         |      |
      |         |      int*
      |         std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/iostream:42,
                 from a.cc:1:
/usr/include/c++/14/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:16: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'int*'
   24 |         cin >> &s;
      |                ^~
/usr/include/c++/14/istream:174:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:16: error: invalid conversion from 'int*' to 'short int' [-fpermissive]
   24 |         cin >> &s;
      |                ^~
      |                |
      |                int*
a.cc:24:16: error: cannot bind rvalue '(short int)(& s)' to 'short int&'
/usr/include/c++/14/istream:177:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:16: error: invalid conversion from 'int*' to 'short unsigned int' [-fpermissive]
   24 |         cin >> &s;
      |                ^~
      |                |
      |                int*
a.cc:24:16: error: cannot bind rvalue '(short unsigned int)(& s)' to 'short unsigned int&'
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:16: error: invalid conversion from 'int*' to 'int' [-fpermissive]
   24 |         cin >> &s;
      |                ^~
      |                |
      |                int*
a.cc:24:16: error: cannot bind rvalue '(int)(& s)' to 'int&'
/usr/include/c++/14/istream:184:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:16: error: invalid conversion from 'int*' to 'unsigned int' [-fpermissive]
   24 |         cin >> &s;
      |                ^~
      |                |
      |                int*
a.cc:24:16: error: cannot bind rvalue '(unsigned int)(& s)' to 'unsigned int&'
/usr/include/c++/14/istream:188:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:16: error: invalid conversion from 'int*' to 'long int' [-fpermissive]
   24 |         cin >> &s;
      |                ^~
      |                |
      |                int*
a.cc:24:16: error: cannot bind rvalue '(long int)(& s)' to 'long int&'
/usr/include/c++/14/istream:192:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:16: error: invalid conversion from 'int*' to 'long unsigned int' [-fpermissive]
   24 |         cin >> &s;
      |                ^~
      |                |
      |                int*
a.cc:24:16: error: cannot bind rvalue '(long unsigned int)(& s)' to 'long unsigned int&'
/usr/include/c++/14/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:16: error: invalid conversion from 'int*' to 'long long int' [-fpermissive]
   24 |         cin >> &s;
      |                ^~
      |                |
      |                int*
a.cc:24:16: error: cannot bind rvalue '(long long int)(& s)' to 'long long int&'
/usr/include/c++/14/istream:203:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:16: error: invalid conversion from 'int*' to 'long long unsigned int' [-fpermissive]
   24 |         cin >> &s;
      |                ^~
      |                |
      |                int*
a.cc:24:16: error: cannot bind rvalue '(long long unsigned int)(& s)' to 'long long unsigned int&'
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:16: error: cannot bind non-const lvalue reference of type 'void*&' to an rvalue of type 'void*'
   24 |         cin >> &s;
      |                ^~
/usr/include/c++/14/istream:219:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:25: note:   no known conversion for argument 1 from 'int*' to 'float&'
  219 |       operator>>(float& __f)
      |                  ~~~~~~~^~~
/usr/include/c++/14/istream:223:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:26: note:   no known conversion for argument 1 from 'int*' to 'double&'
  223 |       operator>>(double& __f)
      |                  ~~~~~~~~^~~
/usr/include/c++/14/istream:227:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:31: note:   no known conversion for argument 1 from 'int*' to 'long double&'
  227 |       operator>>(long double& __f)
      |                  ~~~~~~~~~~~~~^~~
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:36: note:   no known conversion for argument 1 from 'int*' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'}
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |                  ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/istream:126:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__ios_type& (*)(__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>; __ios_type = std::basic_ios<char>]'
  126 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:126:32: note:   no known conversion for argument 1 from 'int*' to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'}
  126 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |                  ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
/usr/include/c++/14/istream:133:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std