#include <iostream>
#include <stdlib.h> // for system function
using namespace std;

typedef unsigned short WORD; // defining word type

void ClearScreen(WORD upper_left, WORD lower_right);

int main()
{
    // bottom right position on a 80x25 text screen.
    WORD upper_left = 0;
    WORD lower_right = (24*16)+78;

    cout << "Filling" << endl;
    cout << " the screen" << endl;
    cout << "  with some" << endl;
    cout << "  dummy text." << endl;
    
    // pause
    system("PAUSE");

    // calling assembler function
    ClearScreen(upper_left, lower_right);

    cout << "Cursor is not reset!" << endl;

    return 0;
}

/* Clear a screen -- 80x25 text -- with current attribute.            *
 * with arguments, upper left and lower right locations                  *
 * upper_left  : (row1 * 16) + col1 because CH is row1 and CL is col1 *
 * lower_right : (row2 * 16) + col2 because DH is row2 and DL is col2 */
void ClearScreen(WORD upper_left, WORD lower_right)
{
    __asm {
        mov    ah, 08h                        ; request get current attribute
        int 10h                            ; and
        mov bh, ah                        ; move it to bh

        mov ax, 0600h                    ; scroll screen with attribute,
                                        ; al = numbers of row; 00 is fullscreen
        mov cx, upper_left                ; upper left location
        mov dx, lower_right                ; lower right location
        int 10h            
    }
}    

Will a miracle save me from learning Windows API?

    __asm {
       mov    ah, 08h                        ; request get current attribute
       int 10h                            ; and
       mov bh, ah                        ; move it to bh
       mov ax, 0600h                    ; scroll screen with attribute,
                                       ; al = numbers of row; 00 is fullscreen
       mov cx, upper_left                ; upper left location
       mov dx, lower_right                ; lower right location
       int 10h            
    }