Backspace and arrow keys in C++ graphics

[anshumanchaube]

Hi. I was trying to make a text editor using C++ graphics. I am using TC++.
For backspace, I move the cursor by 8 pixels(default character size) and print a rectangle(ascii 219) in the background color. The problem lies with the code for backspace when the cursor is at a new line. I also can't get the arrow keys to work. I used their scan codes and the switch is working fine, but instead of moving the cursor to the specified coordinates, it prints a rectangle and shifts the cursor by a few spaces. I have attached the code of the function. I am sorry if this seems like a random barrage of unindented garbage. I refrained from posting the rest, but do let me know if you have to see the rest for any reason.
Thanks.
The code:

struct charpos
{ char ch;
  int x;
};
void textput()
{ charpos a[1000];
  char b[2];
  int x=10;//t=1;
  b[1]='\0';
  for (int i=0;i<10;i++)// 10 for now
 { showcursor();
   b[0]=getch();
   switch (b[0])
  { case 27 : {exit(0);}
    case 13 : {moveto(0,x);
	       x+=10;
	       break;}
    case 8  : { //moverel(-8,0);         //BACKSPACE CODE...
		int x1=getx(),y1=gety();
		//int x1=getx();//cout<<x1; 
		if (x1==0)  // checking if prev input was enter by x coordinate
		{ moveto(a[i-1].x,gety()-10);
		 outtext("THE CURSOR IS HERE ");
		  itoa(a[i-1].x,b,10);//b[0]=(char)a[i-1].x;
		  outtext(b);
		  //moveto((a[i-1].x),(gety()-20));
		break;} // Using stored x coordinate to shift to prev line's end
		else { moveto(getx()-8,gety());
		       setcolor(WHITE);//background color
		       b[0]=219; //a[i-t];
		       outtext(b);
		       colorinit();
		       //t++;
		       moveto(getx()-8,gety());
		       break;
		     }
		}


    case 0: { b[0]=getch(); // trying to work with arrow keys
		 switch(b[0])
		 { case 75: { //outtext("left");
			      moveto(getx()-24,gety());break;}
		   case 77: { //outtext("right");
			      moveto(getx()+8,gety());break;}
		 }
	       }
    case 127 : { moveto(getx()+8,gety());
		 setcolor(WHITE);
		 b[0]=219;
		 outtext(b);
		 colorinit();
	       }
    default : { if(b[0]!=8||b[0]!=0)
		{a[i].ch=b[0];
		a[i].x=getx();
		outtext(b);break;}}
  }


 }
}