learn pi

// Copyright (c) 2013 by Vimja
// This code is released under the terms
// of the WTFPL (What the Fuck Pulic License) version 2.0
// http://sam.zoy.org/wtfpl/

#include <stdio.h>
#include <stdlib.h>
#include <curses.h>
#include <string.h>

int main()
{
  // Huge array to hold 1K of pi numbers
  char pi[] = "3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989";

  // count the numbers
  int i;
  // read in the character
  int c;
  // wanna retry?
  int retry;
  // cursor position
  int cursorX = 5;
  int cursorY = 5;

  // initialize ncurses stuff
  WINDOW *mywindow;
  mywindow = initscr();
  nodelay(mywindow, FALSE);

  do {
    i = 0;
    retry = 'a';

    // prepare ncurses window
    erase();
    printw("pi:\n");
    refresh();
    flushinp();

    // read the input and compare
    do {
      c = getch();
      i++;
    } while ((int)pi[i-1] == c && i-1 < strlen(pi));

    // retrieve cursor position:
    cursorY = getcury(mywindow);
    cursorX = getcurx(mywindow);
    // delete the wrong character
    move(cursorY, cursorX-1);
    delch();

    // now redraw the last (wrong) character, but underline it
    attron(A_UNDERLINE);
    printw("%c", (char)c);
    refresh();
    attroff(A_UNDERLINE);

    // print information about the users score
    printw("\nYou got %d digits of pi right \n", i-1);

    // Teach the user some more numbers
    if(i-1 < (int)strlen(pi)-5)
      printw("Here are the next 5 chars of pi: %c%c%c%c%c \n", pi[i-1], pi[i], pi[i+1], pi[i+2], pi[i+3]);
    else if (i-1 < (int)strlen(pi))
      printw("Here are all the remaining numbers known to this application: %s \n", &pi[i-1]);
    else
      printw("You beat the shit out of this application which has totally ran out of numbers! \n");

    // Ask the user if they want to retry
    do {
      printw("Hit 'r' to retry or 'q' to abort\n");
      refresh();
      flushinp();
      retry = getch();
    } while (retry != 'r' && retry != 'q');

  } while (retry == 'r');

  // kill the ncurses window
  endwin();

  return 0;
}