How do I change the color pixel in C language? [closed]

I vary a lot depending on the operating system, because of your label it is clear that you ask questions for windows.

First of all you change a pixel in a context, be it the console or a widget etc, that's how openGL works, for example, which is a rendering library. A very similar question was asked and the answer that was given serves as an answer to your question link

Use SetPinxel in the header windows.h I encourage you to take a look.

I add a small explanation of the sample code shown in the link and add a small modification because the code draws the cosine function and you only need one pixel.

#include<windows.h>   

int main() 
{
    //Obtiene el identificador de la consola
    HWND myconsole = GetConsoleWindow();
    //Obtiene el identificador del dispositivo del contexto
    //En este caso es la consola
    HDC mydc = GetDC(myconsole);

    //Elige el color
    COLORREF COLOR= RGB(255,255,255); 

    //Son las coordenadas del pixel a modificar
    int crdX = 5, crdY = 10;


    //Dibuja pixel
    SetPixel(mydc,crdX, crdY, COLOR);

    ReleaseDC(myconsole, mydc);
    return 0;
}

As I mentioned, the draws is in a context, the context can be any that is compatible, in this case it is the console, and it is passed to SetPixel, it has as prototype the following form:

It is quoted as it is in the Microsoft documentation, it was only translated by me.

  

This function sets the pixel to the coordinates specified for the specified color.

     

COLORREF SetPixel (    HDC hdc,    int X,    int Y,    COLORREF crColor   );

     

Parameters

     

hdc      [in] Device context handler.

     

X      [in] Specify the X coordinate, in logical units, of the point to be established

     

Y      [in] Specify the Y coordinate, in logical units, of the point to be established

     

crColor      [in] Specifies the color that will be used to paint the point.

     

Return Values

     

The RGB value that the function sets to the pixel indicates success.

  

This value may differ with the color specified by crColor; this   It happens when you can not find a match for the color   specified.

  

-1 indicates failure.

  

To get extended error information, call GetLastError .

     

Remarks

     

The function fails if the pixel coordinates are outside the current crop region.

     

Not all devices with SetPixel support. For more information, see GetDeviceCaps