/*Akshay_Adak_289*/
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds;
using namespace std;
//*******************************************************************
#define fastread() (ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL));
#define ll long long
#define dd double
#define sp setprecision
#define fwd(i,a,b) for(ll i=a;i<b;i++)
#define ubd(v,x) upper_bound(v.begin(),v.end(),x)-v.begin()
#define lbd(v,x) lower_bound(v.begin(),v.end(),x)-v.begin()
#define ff first
#define ss second
#define sort(x) sort(x.begin(),x.end())
#define rev(x) reverse(x.begin(),x.end())
#define pb push_back
#define MP make_pair
#define vi vector<int>
#define vll vector<ll>
#define vlp vector<pair<ll,ll>>
#define vpq priority_queue<ll>
#define vqq  priority_queue<ll,vector<ll>,greater<ll>>
#define vpqq priority_queue<pair<ll,ll>, vector<pair<ll,ll>>, compare> 
#define mod  1000000007     //998244353
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> 
#define w(x)  \
    int x;    \
    cin >> x; \
    while (x--)
//***************************************************


//***************************************************
void solve()
{
  
}

//****************************************************
int main()
{
  fastread();
          //         w(x){ solve();cout<<endl;  }    
                  solve();  
}

C++ Online Compiler

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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
}