pic16f877a display 7 segments with input from rs232

hi all experts.. i need some help here..
my project is to create a program which read the input from pc keyboard through rs232 to compare it whether it is correctly key in according to the snellen chart..

i have done the program but it just doesnt work on my hardware...
i am using pic-c compiler..

can anybody please help me to check if my program got any problem???

thousands appreciate to all experts who can help me out...

*beg* *beg*

following is my program

/////////////////////////////////////////////////////////////////////////
//// Configure the CCS prototype card as follows: ////
//// LED seg a Pin B0 ////
//// LED seg b Pin B1 ////
//// LED seg c Pin B2 ////
//// LED seg dp Pin B3 ////
//// LED seg d Pin B4 ////
//// LED seg e Pin B5 ////
//// LED seg f Pin B6 ////
//// LED seg g Pin B7 ////
/////////////////////////////////////////////////////////////////////////
#if defined(__PCB__)
#include <16C56.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_A3, rcv=PIN_A2)
#elif defined(__PCM__)
#include <16F877a.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#endif
char input;
int score;
//0,1,2,3,4,5,6,7,8,9,all light up
BYTE CONST LED_MAP[11] = {0x88,0xf9,0x4c,0x68,0x39,0x2a,0x0b,0xf8,0x08,0x38,0xff};
////////////////LED OUTPUT DISPLAY///////////////////
void ending (void)
{
switch (score){
case 0:
output_e(LED_MAP[10]);
output_b(LED_MAP[0]);
output_d(LED_MAP[0]);
break;
case 1:
output_e(LED_MAP[10]);
output_b(LED_MAP[0]);
output_d(LED_MAP[1]);
break;
case 3:
output_e(LED_MAP[10]);
output_b(LED_MAP[0]);
output_d(LED_MAP[3]);
break;
case 5:
output_e(LED_MAP[10]);
output_b(LED_MAP[0]);
output_d(LED_MAP[5]);
break;
case 8:
output_e(LED_MAP[10]);
output_b(LED_MAP[0]);
output_d(LED_MAP[8]);
break;
case 11:
output_e(LED_MAP[10]);
output_b(LED_MAP[1]);
output_d(LED_MAP[1]);
break;
case 14:
output_e(LED_MAP[10]);
output_b(LED_MAP[1]);
output_d(LED_MAP[4]);
break;
case 18:
output_e(LED_MAP[10]);
output_b(LED_MAP[1]);
output_d(LED_MAP[8]);
break;
case 22:
output_e(LED_MAP[10]);
output_b(LED_MAP[2]);
output_d(LED_MAP[2]);
break;
case 26:
output_e(LED_MAP[10]);
output_b(LED_MAP[2]);
output_d(LED_MAP[6]);
break;
case 30:
output_e(LED_MAP[10]);
output_b(LED_MAP[3]);
output_d(LED_MAP[0]);
break;
case 35:
output_e(LED_MAP[10]);
output_b(LED_MAP[3]);
output_d(LED_MAP[5]);
break;
case 40:
output_e(LED_MAP[10]);
output_b(LED_MAP[4]);
output_d(LED_MAP[0]);
break;
case 45:
output_e(LED_MAP[10]);
output_b(LED_MAP[4]);
output_d(LED_MAP[5]);
break;
case 50:
output_e(LED_MAP[10]);
output_b(LED_MAP[5]);
output_d(LED_MAP[0]);
break;
case 55:
output_e(LED_MAP[10]);
output_b(LED_MAP[5]);
output_d(LED_MAP[5]);
break;
case 61:
output_e(LED_MAP[10]);
output_b(LED_MAP[6]);
output_d(LED_MAP[1]);
break;
case 67:
output_e(LED_MAP[10]);
output_b(LED_MAP[6]);
output_d(LED_MAP[7]);
break;
case 73:
output_e(LED_MAP[10]);
output_b(LED_MAP[7]);
output_d(LED_MAP[3]);
break;
case 79:
output_e(LED_MAP[10]);
output_b(LED_MAP[7]);
output_d(LED_MAP[9]);
break;
case 85:
output_e(LED_MAP[10]);
output_b(LED_MAP[8]);
output_d(LED_MAP[5]);
break;
case 91:
output_e(LED_MAP[10]);
output_b(LED_MAP[9]);
output_d(LED_MAP[1]);
break;
case 98:
output_e(LED_MAP[10]);
output_b(LED_MAP[9]);
output_d(LED_MAP[8]);
break;
case 105:
output_e(LED_MAP[1]);
output_b(LED_MAP[0]);
output_d(LED_MAP[5]);
break;
case 112:
output_e(LED_MAP[1]);
output_b(LED_MAP[1]);
output_d(LED_MAP[2]);
break;
case 119:
output_e(LED_MAP[1]);
output_b(LED_MAP[1]);
output_d(LED_MAP[9]);
break;
case 126:
output_e(LED_MAP[1]);
output_b(LED_MAP[2]);
output_d(LED_MAP[6]);
break;
case 133:
output_e(LED_MAP[1]);
output_b(LED_MAP[3]);
output_d(LED_MAP[3]);
break;
case 140:
output_e(LED_MAP[1]);
output_b(LED_MAP[4]);
output_d(LED_MAP[0]);
break;
case 147:
output_e(LED_MAP[1]);
output_b(LED_MAP[4]);
output_d(LED_MAP[7]);
break;
}
}
////////////////////////////////////////////////
void v2 (void)
{
if ((input = getc()) == 'v')
{score=score+7;
ending();}
else
{ ending();}
}
void o4 (void)
{
if ((input = getc()) == 'o')
{score=score+7;
v2();}
else
{ ending();}
}
void a4 (void)
{
if ((input = getc()) == 'a')
{score=score+7;
o4();}
else
{ ending();}
}
void h3 (void)
{
if ((input = getc()) == 'h')
{score=score+7;
a4();}
else
{ ending();}
}
void t3 (void)
{
if ((input = getc()) == 't')
{score=score+7;
h3();}
else
{ ending();}
}
void x4 (void)
{
if ((input = getc()) == 'x')
{score=score+7;
t3();}
else
{ ending();}
}
void u4 (void)
{
if ((input = getc()) == 'u')
{score=score+7;
x4();}
else
{ ending();}
}
void y3 (void)
{
if ((input = getc()) == 'y')
{score=score+7;
u4();}
else
{ ending();}
}
void x3 (void)
{
if ((input = getc()) == 'x')
{score=score+6;
y3();}
else
{ ending();}
}

void u3 (void)
{
if ((input = getc()) == 'u')
{score=score+6;
x3();}
else
{ ending();}
}
void o3 (void)
{
if ((input = getc()) == 'o')
{score=score+6;
u3();}
else
{ ending();}
}
void y2 (void)
{
if ((input = getc()) == 'y')
{score=score+6;
o3();}
else
{ ending();}
}
void a3 (void)
{
if ((input = getc()) == 'a')
{score=score+6;
y2();}
else
{ ending();}
}
void h2 (void)
{
if ((input = getc()) == 'h')
{score=score+6;
a3();}
else
{ ending();}
}
void t2 (void)
{
if ((input = getc()) == 't')
{score=score+5;
h2();}
else
{ ending();}
}
void x2 (void)
{
if ((input = getc()) == 'x')
{score=score+5;
t2();}
else
{ ending();}
}
void a2 (void)
{
if ((input = getc()) == 'a')
{score=score+5;
x2();}
else
{ ending();}
}
void u2 (void)
{
if ((input = getc()) == 'u')
{score=score+5;
a2();}
else
{ ending();}
}
void v (void)
{
if ((input = getc()) == 'v')
{score=score+5;
u2();}
else
{ ending();}
}
void o2 (void)
{
if ((input = getc()) == 'o')
{score=score+4;
v();}
else
{ ending();}
}
void y (void)
{
if ((input = getc()) == 'y')
{score=score+4;
o2();}
else
{ ending();}
}
void t (void)
{
if ((input = getc()) == 't')
{score=score+4;
y();}
else
{ ending();}
}
void h (void)
{
if ((input = getc()) == 'h')
{score=score+4;
t();}
else
{ ending();}
}
void a (void)
{
if ((input = getc()) == 'a')
{score=score+3;
h();}
else
{ ending();}
}
void u (void)
{
if ((input = getc()) == 'u')
{score=score+3;
a();}
else
{ ending();}
}
void x (void)
{
if ((input = getc()) == 'x')
{score=score+3;
u();}
else
{ ending();}
}
void g (void)
{
if ((input = getc()) == 'g')
{score=score+2;
x();}
else
{ ending();}
}
void o (void)
{
if ((input = getc()) == 'o')
{score=score+2;
g();}
else
{ending();}
}
main()
{
int countdown;
set_tris_b(0);
set_tris_d(0);
set_tris_e(0);
//blink the 7 segments
output_b(0);
output_d(0);
for (countdown = 50 ; countdown != 0 ; countdown--)
{
delay_us(10);
}
output_b(1);
output_d(1);
//end of blinking
score = 0;
if ((input = getc()) == 'e')//start the input from pc keyboard through rs232
{++score;
o();}
else
{ ending();}
return 0;
}