#include <iostream>
#include "ArduinoJson.h"

int main() {
  // Allocate the JSON document
  //
  // Inside the brackets, 200 is the RAM allocated to this document.
  // Don't forget to change this value to match your requirement.

  StaticJsonDocument<1024> doc;

  // StaticJsonObject allocates memory on the stack, it can be
  // replaced by DynamicJsonDocument which allocates in the heap.
  //
  // DynamicJsonDocument  doc(200);

  // StaticJsonObject allocates memory on the stack, it can be
  // replaced by DynamicJsonDocument which allocates in the heap.
  //
  // DynamicJsonDocument  doc(200);

  // Add values in the document
  //
  //doc["sensor"] = "gps";
  //doc["time"] = 1351824120;

  // Add an array.
  //

  //JsonArray data = doc.createNestedArray("data");
  //data.add(48.756080);
  //data.add(2.302038);
  JsonObject value = doc.createNestedObject("value");
  JsonObject h2 = value.createNestedObject("h2");
  JsonObject s1 = h2.createNestedObject("s1");
  JsonObject temp = value.createNestedObject("temp");  
  JsonObject HighP = value.createNestedObject("HighP");
  JsonObject LowP = value.createNestedObject("LowP");

   
  s1["status"] = "Offline";
  s1["value"] = 0;


  //JsonArray h2data = h2.createNestedArray("data");
  //h2["s1"] = "Offline";
  //h2["s2"] = "Offline";
 // h2["s3"] = "Offline";
  //h2["s4"] = "Offline";
  //h2["s5"] = "Offline";
  //h2["s6"] = "Offline";

  temp["t1"] = "Offline";
  temp["t2"] = "Offline";
  temp["t3"] = "Offline";
  temp["t4"] = "Offline";
  temp["t5"] = "Offline";
  temp["t6"] = "Offline";

  HighP["hp1"] = "Offline";
  HighP["hp2"] = "Offline";

  LowP["lp"] = "Offline";
    


  // Generate the minified JSON and send it to STDOUT
  //
  serializeJson(doc, std::cout);
  // The above line prints:
  // {"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}

  // Start a new line
  std::cout << std::endl;

  // Generate the prettified JSON and send it to STDOUT
  //
  serializeJsonPretty(doc, std::cout);


}

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
}