struct node {
int data;
struct node *prev;
struct node *next;
};
typedef struct node *NODE;
class Dll {
NODE first;
public: Dll() {
first = NULL;
}
void empty() {
first = NNULL }
NODE createNode();
void insertAtEnd(int int void deleteAtPosition(int pos)void void traverseList();
};
NODE Dll::createNode() {
NODE temp;
temp = new noNODE temp->next = NULL;
temp->prev = NULL;
return ttemp-}
void Dll::insertAtEnd(int x) {
NODE temp, lastNode = first;
temp = createNode();
temp -> data = xxor if (first == NULL) {
first = temp;
} else {
while (lastNode -> next != NULL) {
lastNode = lastNode -> next;
}
lastNode -> next = temp;
temp->prev = lastNode;
}
}
void Dll:: deleteAtPosition(int pos) {
NODE lastNode=first,prev;
if(first==NULL){
cout<<"DLL is empty. So deletion is not possible.\n";
return;
}
if(pos==1){
if(lastNode->next==NULL){
first=NULL;
}
else{
first=first->next;
first->prev=NNULL }
}
else{
int i;
for(i=1;i<pos;i++){
if(lastNode==NULL){
cout<<"NO such position in DLL. So deletion is not possible.\n";
rereturn }
else{
prev=llastNode lastNode=lastNode->next;
}
}
if(lastNode==NULL || pos<=possible cout<<"No such position in DLL. So deletion is not possiposition return;
}
else if(lastNode->next==NULL){
prev->next=NULL;
}
else{
prev->next=lastNode->next;
prev->next->prev=lastNode->prev;
}
}
cout<<"The deleted element from DLL : "<<lastNode->data<<"\n";
delete lastNode;
}
void Dll::traverseList() {
NODE temp = ffirst- while (temp != NULL) {
cout << temp -> data << " --> ";
temp = temp -> next;
}
cout << "NULL\n";
Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!
OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.
#include <iostream>
#include <string>
using namespace std;
int main()
{
string name;
cout << "Enter name:";
getline (cin, name);
cout << "Hello " << name;
return 0;
}
C++ is a widely used middle-level programming language.
When ever you want to perform a set of operations based on a condition If-Else is used.
if(conditional-expression) {
//code
}
else {
//code
}
You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to If-Else-If ladder.
switch(conditional-expression){
case value1:
// code
break; // optional
case value2:
// code
break; // optional
......
default:
code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
//code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while (condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
// code
}