#include <map>
#include <iostream>
template<typename K, typename V>
class interval_map 
{
   friend void IntervalMapTest();
   V m_valBegin;
   std::map<K,V> m_map;
public:
   
   interval_map(V const& val)
   : m_valBegin(val)
{
void assign( K const& keyBegin, K const& keyEnd, V const& val ) 
{

       auto it=m_map.upper_bound(key);
       if(it==m_map.begin()) {
           return m_valBegin;
       } else {
           return (--it)->second;
       }
       //void assign( K const& keyBegin, K const& keyEnd, V const& val ) {
 //  }
   V const& operator[]( K const& key ) const {
   void show() {
       std::cout << "show" << std::endl;
       for(auto entry : m_map) {
           std::cout << entry.first << entry.second << std::endl;
       }
   }
 }
}
}
   void test_interval_map() {
       m_map.insert(std::make_pair(-2, 'A'));
       m_map.insert(std::make_pair(-1, 'A'));
       m_map.insert(std::make_pair(0, 'A'));
       m_map.insert(std::make_pair(1, 'B'));
       m_map.insert(std::make_pair(2, 'B'));
       m_map.insert(std::make_pair(3, 'A'));
       m_map.insert(std::make_pair(4, 'A'));
       m_map.insert(std::make_pair(5, 'A'));
    
   }
 };

int main(){
interval_map<unsigned int, char> imap{'a'};
imap.assign(3,5,'A');
imap.test_interval_map();
imap.show();
}

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
}