delay.h

#include<iostream>
#include<time.h>
#include<windows.h>
void delay(int sec)
{
clock_t goal= sec + clock();
while (goal>clock());
}

void clear_screen ()
{
    DWORD n;                         /* Number of characters written */
    DWORD size;                      /* number of visible characters */
    COORD coord = {0};               /* Top left screen position */
    CONSOLE_SCREEN_BUFFER_INFO csbi;

    /* Get a handle to the console */
    HANDLE h = GetStdHandle ( STD_OUTPUT_HANDLE );

    GetConsoleScreenBufferInfo ( h, &csbi );

    /* Find the number of characters to overwrite */
    size = csbi.dwSize.X * csbi.dwSize.Y;

    /* Overwrite the screen buffer with whitespace */
    FillConsoleOutputCharacter ( h, TEXT ( ' ' ), size, coord, &n );
    GetConsoleScreenBufferInfo ( h, &csbi );
    FillConsoleOutputAttribute ( h, csbi.wAttributes, size, coord, &n );

    /* Reset the cursor to the top left position */
    SetConsoleCursorPosition ( h, coord );
}