Code for RE to NFA

Please look at this code, i can not make it fulfill for RE to NFA conversion. If anyone know try to solve.
#include <stdio.h>
#include <conio.h>
#include <graphics.h>
#include <stdlib.h>
void main()
{
clrscr();
int gdriver = DETECT, gmode,i=0;
char a,data[5];

printf("expression:");
do
{ a=getchar();
data=a;
i++;
}while(a!='\n');
initgraph(&gdriver, &gmode, "c:\tc\bgi");
if(data[1]=='+')
{
circle(40,100,8);
circle(100,100,8);
circle(300,100,8);
circle(150,50,8);
circle(250,50,8);
circle(150,150,8);
circle(250,150,8);
circle(370,100,8);
circle(370,100,12);
line(40,100,100,100);
line(100,100,150,50);
line(150,50,250,50);
line(100,100,150,150);
line(150,150,250,150);
line(250,50,300,100);
line(300,100,250,150);
line(300,100,370,100);
outtextxy(120,60,"e");
outtextxy(120,130,"e");
outtextxy(280,60,"e");
outtextxy(280,130,"e");
outtextxy(200,40,"a");
outtextxy(200,160,"b");
outtextxy(70,90,"e");
outtextxy(340,90,"e");
}
else
{
circle(100,100,10);
circle(200,100,10);
circle(300,100,10);
line(110,100,200,100);
line(200,100,300,100);
outtextxy(150,80,"a");
outtextxy(250,80,"b");
}
getch();
closegraph();

}