#include<bits/stdc++.h>
using namespace std;

int a[101];
int n = 0;

void print(){
    cout<<endl;
    int newLine = 2;
    for(int i=1; i<=n; i++){
        cout<<a[i]<<" ";
        if(i==newLine-1){
            cout<<endl;
            newLine*=2;
        }
    }
    cout<<endl<<endl;
}

void printArray(){
    for(int i=1; i<=n; i++) cout<<a[i]<<" ";
    cout<<endl;
}

bool heapInsert(int v){
    if(n==100)    return false;

}

int extractMax(){
    if(n==0)    return -9999;

}

void sort(){

}



void buildHeap(){

}

void increaseKey(int v1, int v2){

}

int size(){

}

int main(){
    cout<<"1. Insert\n2. Extract max\n3. Sort\n4. Increase Key\n5. Size\n6. Print\n7. Exit"<<endl;
    int choice;
    while(1){
        cin>>choice;
        if(choice==1){
            int v;
            cin>>v;
            heapInsert(v);
        }
        else if(choice == 2){
            int v = extractMax();
            cout<<v<<endl;
        }
        else if(choice==3){
            sort();
            printArray();
            buildHeap();
        }

        else if(choice==4){
            int v1, v2;
            cin>>v1>>v2;
            increaseKey(v1,v2);
        }
        else if(choice==5){
            int s = size();
            cout<<s<<endl;
        }
        else if(choice==6){
            print();
        }
        else{
            break;
        }
    }
}

/*
1 2
1 9
1 8
1 16
1 3
1 7
1 10
1 1
1 4
1 14
6
3
6
*/

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
}