captcha in c programming | generate captcha in c++ language | how captcha work in c program | learn c language

 // _________ WELCOME ALL OF YOU ON COMPUTER SOFT SKILLS CHANNEL ___________

//________________ C++ PROGRAMMING TO GENERATE RANDOM CAPTCHA ______________

#include<stdio.h>

#include<conio.h>

#include <stdlib.h>

#include <dos.h>

#include <graphics.h>

int main()

{

  int i = 0, key, n, x, gd = DETECT, gm;

  char a[10];

  initgraph(&gd, &gm, "C:\\TC\\BGI");

  setbkcolor(15);

  x = getmaxx()/2;

  settextstyle(1, 0, 5);

  settextjustify(1,1);

  setcolor(5);

  outtextxy(x, 20, "CAPTCHA");

  settextstyle(1, 0, 3);

  settextjustify(1,1);

  setcolor(12);

  outtextxy(x, 125, "Press any key to change the generated \"CAPTCHA\"");

  outtextxy(x, 160, "Press escape key to exit...");

  setcolor(15);

  setviewport(100, 200, 600, 400, 1);

  setcolor(RED);

  randomize();

  while (1)

  {

    while (i < 6)

    {

      n = random(3);

      if (n == 0)

      a[i] = 65 + random(26);   // 65 is the ASCII value of A

      else if (n == 1)

a[i] = 97 + random(26); // 97 is the ASCII value of a

      else

a[i] = 48 + random(10); // 48 is the ASCII value of 0

      i++;

    }

    a[i] = '\0';

    outtextxy(210, 100, a);

    key = getch();

// Press Escape key to exit

    if (key == 27)

      exit(0);

    clearviewport();

    i = 0;

  }

}

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