Realization of art clear screen with C language

Question: We are in the process of programming, often use to clear screen processing, such as under the DOS under the Cls,turbo C CLRSCR () and so on have clear screen function, but these are the general meaning of the clear screen,

Does not show its clear screen rule. And sometimes in order to achieve the clear screen of the artistic beauty, often on the clear screen has some specific requirements, such as: Opening clear screen, closing the screen; on the clear screen;

The use of C language to develop a number of child functions, used in the program, can not only achieve the purpose of clear screen, there can increase the artistic appearance of the screen.

Child functions and Demo programs:

#include <stdio.h>
#include <dos.h>
#include <conio.h>
void Goto_xy (int x,int y);
void dcls (int x1,int x2,int y1,int y2);
void bcls (int x1,int x2,int y1,int y2);
void kcls (int x1,int x2,int y1,int y2);
void recls (int x1,int x2,int y1,int y2);
void zcls (int x1,int x2,int y1,int y2);
void Puta (void);

/*--------------Demo Program---------------------* *
Main ()
{
Puta ();
Getch ();
Dcls (0,4,0,79);
Getch ();
Puta ();
Getch ();
BCLS (0,25,0,79);
Getch ();
Puta ();
Getch ();
Zcls (0,25,0,79);
Getch ();
}
/*********center Clear Screen (center ***********/)
void zcls (int x1,int x2,int y1,int y2)
{
int x00,y00,x0,y0,i,d;
if ((y2-y1) > (x2-x1)) {
D= (X2-X1)/2;
x0= (X1+X2)/2;
Y0=y1+d;
y00=y2-d;
For (i=0;i< (d+1); i++)
Recls ((x0-i), (X00+i), (Y0-i), (y00+i));
Delay (10);
}
else{
D= (y2-y1)/2;
y0= (Y1+y2)/2;
X0=x1+d;
x00=x2-d;
for (i=0;i<d+1;i++)
Recls (X0-i,x00+i,y0-i,y00+i);
Delay (10);
}
}
/************* Clear Rectangle side (rectangular Benting) ***********************/
void recls (int x1,int x2,int y1,int y2)
{
int i,j;
for (i=y1;i<y2;i++) {
Goto_xy (X1,i);
Putchar (");
Goto_xy (X2,i);
Putchar (");
Delay (10);
}
for (j=x1;j<x2;j++) {
Goto_xy (I,Y1);
Putchar (");
Goto_xy (J,Y2);
Putchar (");
Delay (10);
}
}
/******************open Screen Clear (open screen type) *********************/
void kcls (int x1,int x2,int y1,int y2)
{
int t,s,i,j;
t=s= (Y1+y2)/2;
for (; t<=y2;t++,s--)
for (j=x1;j<x2;j++) {
Goto_xy (j,t);
Putchar (");
Goto_xy (j,s);
Putchar (");
Delay (10);
}
}
/*****************close Screen clear***** Closing Ceremony *******************/
void bcls (int x1,int x2,int y1,int y2)
{
int t,s,j;
T=y1;
S=y2;
For (t=y1;t< (y1+y2)/2;t++,s--)
for (j=x1;j<x2;j++) {
Goto_xy (j,t);
Putchar (");
Goto_xy (j,s);
Putchar (");
Delay (10);
}
}
/******************bottom screen Clear (from down) ********************/
void dcls (int x1,int x2,int y1,int y2)
{
int t,s,j,i;
t=s= (Y1+y2)/2;
for (j=x2;j>x1;j--)
for (i=y1;i<y2;i++) {
Goto_xy (J,i);
Putchar (");
Delay (10);
}
}
/****************** set the cursor child function ******************/
void Goto_xy (int x,int y)
{
Union regs R;
r.h.ah=2;
R.h.dl=y;
R.h.dh=x;
r.h.bh=0;
Int86 (0X10,&AMP;R,&AMP;R);
}
/********************** a series of a letters on the screen to demonstrate the program ******************/
void Puta (void)
{
int i,j;
for (i=0;i<24;i++) {
for (j=0;j<79;j++) {
Goto_xy (I,J);
printf ("a");
}
}
}