#define cimg_use_png
//#include "CImg.h"
#include <iostream>
#include <vector>
#include <fstream>
#include <sstream>
using namespace std;

struct xyrgb {
    float x;
    float y;
    float red;
    float green;
    float blue;
};

struct rgba {
    int red;
    int green;
    int blue;
    int alpha;
};

const struct rgba INIT = {
    0, 0, 0, 0
};

int main(int argc, char **argv) {
    // Input read-in
    string inputFile = argv[1];
    cout << inputFile << endl;
    stringstream ss(inputFile);
    
    // Read in line-by-line
    //ifstream inFile(inputFile);
    string currLine;
    vector<string> inputs;
    string temp;

    // Variable initialization
    vector<vector<rgba>> image;
    string filename;
    vector<xyrgb> xyrgbVec;

    // Loop till end of file
    while(getline(ss, currLine, '\n')) {
        cout << currLine << endl;
        // Tokenize current line
        inputs.clear();
        stringstream str(currLine);
        while(getline(str, temp, ' ')) {
            inputs.push_back(temp);
        }
        
        cout << inputs[0] << endl;
        
        // Check inputs is valid
        if(inputs.size() == 0) {
            continue;
        }

        // Run input through command switch-case
        if (inputs[0] == "png") {
            int width = stoi(inputs[1]);
            int height = stoi(inputs[2]);
            filename = inputs[3];

            //image = vector<vector<rgba>> matrix(width, vector<rgba>(height, INIT));
        } else if (inputs[0] == "xyrgb") {
            xyrgb temp = {
                stof(inputs[1]),
                stof(inputs[2]),
                stof(inputs[3]),
                stof(inputs[4]),
                stof(inputs[5]),
            };
            xyrgbVec.push_back(temp);
        }
    }
    
    cout << xyrgbVec.size() << endl;
    cout << xyrgbVec[1].x << " " << xyrgbVec[1].y << xyrgbVec[1].red << xyrgbVec[1].green << xyrgbVec[1].blue << endl;
}

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
}