CODEWITHSUNDEEP
c++
Sneha Paranjape
Sneha Paranjape

Reputation: 11

no matching function for call to ‘node::node()’

I am creating and displaying an singly linked list. However there is an error in the main function

no matching function for call to ‘node::node()’

Following is my code:

#include <iostream.h>
 using namespace std;
 class node
 {
  node *next,*start,*ptr;
  int data;

  public:

  node(int d)
  {
    data=d;
    next=NULL;
    start=NULL;
    ptr=NULL;
  }
    void create();
    void display();

};

void node::create()
{
int d;
char ch;
node *temp;
do
{
cout<<"Enter data";
cin>>d;
temp=new node(d);
if(start==NULL)
{
    start=temp;
}
else
{
    ptr=start;
    while(ptr->next!=NULL)
    {
        ptr=ptr->next;
    }
    ptr->next=temp;
    temp->next=NULL;
}
cout<<"\nDo you want to enter more data?";
cin>>ch;
}while(ch=='y'||ch=='Y');
}
void node::display()
{
ptr=start;
while(ptr->next!=NULL)
{
    cout<<"\n"<<ptr->data;
    ptr=ptr->next;
}
cout<<"\n"<<ptr->data;
}
int main()
{
node n;
int c;
char a;
do
{
cout<<"*****MENU*****";
cout<<"\n1.Create \n2.Display";
cout<<"\nEnter your choice";
cin>>c;
switch(c)
{
case 1:
n.create();
break;
case 2:
    n.display();
break;
default:
    cout<<"\nInvalid choice";
    break;
}
cout<<"\nDo you want to continue?";
cin>>a;
}while(a=='y'||a=='Y');
    return 0;
}

When I write the same program using a friend class of node, the program executes successfully. Why do we need to use more than one class?

Upvotes: 0

Views: 8974

Answers (1)

Slava
Slava

Reputation: 44258

For your class node you defined only one constructor, that accepts parameter type int, which means you can construct instances of this class with such parameter, what you do here:

temp=new node(d); // fine, you pass int d to construct node

but in main() you try to create instance of class node without any parameters:

int main()
{
    node n; // <---- problem

so either pass integer when you create n in main() or define another constructor without any parameters (aka default constructor) for class node.

Upvotes: 2

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