No.	Title and link
1.	Introduction to C++
2.	Variables, branching, and loops
3.	Functions and recursions
4.	Pointers
5.	Linked lists
6.	Stacks
7.	Sequences
8.	Pointers practice
9.	References
10.	Sorting
11.	Object oriented programming
12.	Trees in C++
13.	Balanced trees
14.	Sets and maps: simplified
15.	Sets and maps: standard
16.	Dynamic programming
17.	Vectors
18.	Representation of integers in computers
19.	Floating point representation
20.	Templates
21.	Inheritance
22.	Pointers to functions
23.	Multi core programming and threads
24.	Reading data from internet
25.	Graphic cards and OpenCL
26.	OpenCL on AWS
27.	OpenCV and optical mark recognition

24. Reading Data from Internet

cURL library

The library cURL is needed to read documents from internet. Install the library using one of the following commands (one of them should hopefully work):

sudo apt install curl

sudo apt-get install libcurl4-openssl-dev

sudo apt-get install libcurl4-gnutls-dev

Example of a program that reads data from a website

// visitURL.cpp
// compile with
// c++ visitURL.cpp -o vurl -lcurl -std=c++11
// execute with
// ./vurl

#include <iostream>
#include <string>
#include <fstream>
#include <curl/curl.h>
 
static size_t f(void *p, size_t s, size_t m, void *u)
{
 ((std::string*)u)->append((char*)p, s * m);
 return s * m;
}
std::string readFromURL(const std::string & mainLink){
 CURL *curl;
 std::string result;
 curl = curl_easy_init();
 if(curl) {
   const char* linkArrayChar=mainLink.c_str();
   curl_easy_setopt(curl, CURLOPT_URL, linkArrayChar);
   curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, f);
   curl_easy_setopt(curl, CURLOPT_WRITEDATA, & result);
   curl_easy_perform(curl);
   curl_easy_cleanup(curl);
 }
 return result;
}
int main(){
 std::string res=readFromURL("https://imomath.com/");
 std::cout<<res<<"\n";
 return 0;
}