Input Nilai & Grafik (C++)

saya akan membagi sedikit source kode mengenai C++... Source kode ini merupakan ujian matakuliah c++ di kampus saya..hehe
cekidot....

#include<iostream.h>

#include<conio.h>

void main()

{

int i=1,a=0,b=0,c=0,d=0,e=0, nilai;

char ket='y',NH;

cout<<"             Nilai Siswa\n";

cout<<"============================================\n";

while(ket=='y')

{

cout<<"Nilai Siswa ke-"<<i<<"=";cin>>nilai;

if(nilai <45){

NH='e' ; e=e+1;}

else if(nilai <60){

NH='d' ; d=d+1;}

else if(nilai <70){

NH='c' ; c=c+1;}

else if(nilai <80){

NH='b' ; b=b+1;}

else if(nilai <101){

NH='a' ; a=a+1;}

i++;

cout<<"lagi[y/n]?";ket=getche ();

cout<<"\===============================================\n";

}

clrscr();

for(int m=0;m<=i;m++)

{gotoxy(2,(5+i)-m);

cout<<m;}

for(int n=0;n<=i;n++)

{gotoxy(4,(5+i)-n);

cout<<"|";}

for(int p=0;p<=5;p++)

{gotoxy(5+p,5+i);

cout<<"--------------------------";}

gotoxy(10,6+i);cout<<"a";

gotoxy(15,6+i);cout<<"b";

gotoxy(20,6+i);cout<<"c";

gotoxy(25,6+i);cout<<"d";

gotoxy(30,6+i);cout<<"e";

for(int r=0;r<=a;r++)

{gotoxy(10,(5+i)-r);

cout<<"xx";}

for(int s=0;s<=b;s++)

{gotoxy(15,(5+i)-s);

cout<<"xx";}

for(int t=0;t<=c;t++)

{gotoxy(20,(5+i)-t);

cout<<"xx";}

for(int u=0;u<=d;u++)

{gotoxy(25,(5+i)-u);

cout<<"xx";}

for(int v=0;v<=e;v++)

{gotoxy(30,(5+i)-v);

cout<<"xx";}

}