#include<stdio.h>
#include<conio.h>
struct rec

{
long num;
struct rec *left;
struct rec *right;
};
struct rec *tree,*second,*head;
struct rec *insert(struct rec *tree,long num);
struct rec *copy(struct rec *tree);
void inorder(struct rec *tree);
main()
{
int choice;
long digit;
do
{
choice=select();
switch(choice)
{
case 1:puts("Enter integers:To quit enter 0");
scanf("%ld",&digit);
while(digit!=0)
{
tree=insert(tree,digit);
scanf("%ld",&digit);
}continue;
case 2: copy(tree);continue;
case 3: puts("Inorder traversing TREE");
inorder(tree);continue;
case 4: puts("END");exit(0);
}
}while(choice!=4);
}
int select()
{
int selection;
do
{
puts("Enter 1: Insert a node in the BST");
puts("Enter 2: Copy a tree to another BST");
puts("Enter 3: Display(inorder)the BST");
puts("Enter 4: END");
puts("Enter your choice");
scanf("%d",&selection);
if((selection<1)||(selection>4))
{puts("Wrong choice: Try again");
getchar();
}
}while((selection<1)||(selection>4));
return selection;
}
struct rec *insert(struct rec *tree,long digit)
{
if(tree==NULL)
{
tree=(struct rec *)malloc(sizeof(struct rec));
tree->left=tree->right=NULL;
tree->num=digit;

}
else
if(digit<tree->num)
tree->left=insert(tree->left,digit);
else if(digit>tree->num)
tree->right=insert(tree->right,digit);
else if(digit==tree->num)
{puts("Duplicate nodes: program exited");exit(0);
}
return(tree);
}
struct rec *copy(struct rec *tree)
{
second=(struct rec *)malloc(sizeof(struct rec));
head=second;
if(tree!=NULL)
{
second->num=tree->num;
if(tree->left!=NULL)
{
second->left->num=tree->left->num;
copy(tree->right);
}
if(tree->right!=NULL)
{
second->right->num=tree->num;
copy(tree->left);
}
}
return(head);
}
void inorder(struct rec *tree)
{
if(tree!=NULL)
{
inorder(tree->left);
printf("%12ld\n",tree->num);
inorder(tree->right);
}
}

C++ Online Compiler

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!

Read inputs from stdin

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;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

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.

2. Switch:

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;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

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 
}

5. Do-While:

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);

Functions

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.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}