Bài tập bị lỗi phông chữ

Đây là bt môn ngôn ngữ hình thức của mình.nhưng k hiểu sao sau khi nhập n show ra cứ bị lỗi phông chữ. bạn nào biết sửa giúp mình với ^^

#include<iostream>
using namespace std;

typedef struct otomat
{
	char vt, vp, kh;
}OTMA;

bool lap(OTMA [], OTMA gt, int dc);
void nhapdc(OTMA &gt);
bool timdce(OTMA gt); 
bool thuanhan(char p, char *f, int q);
bool thua_nhan(char *f, int q, OTMA gt);
void show(OTMA gt);
OTMA cong(OTMA x, OTMA y);
void thuchien(OTMA *p, int &dc, char *f, int &q);
void show_dc(otomat *p, int dc, char *f, int q);
void nhap(OTMA *p, int &dc, char *f, int &q, char *a, int &n, char *b, int &m, char s);
int main()
{
	char a[100];
	char b[100];
	char f[20]; 
	OTMA p[100]; 
	int q, dc;
	int n, m;
	char s;
	nhap(p, dc, f, q, a, n, b, m, s);
	thuchien(p, dc, f, q);
	show_dc(p, dc, f, q);
	system("pause");
	return 0;
}

bool lap(OTMA *p, OTMA gt, int dc)//tim ra n~trang thai den chinh no
{
	for (int i = 0; i<dc; i++)
	if ((gt.vt == p[i].vt) && (gt.vp == p[i].vp) && (gt.kh == p[i].kh)) return true;
	return false;
}

void nhapdc(OTMA &gt)
{
	cout << "Trang thai nguon = "; 
    fflush(stdin);
    cin.get(gt.vt);
	gt.vt = toupper(gt.vt);
	cout << "Trang thai nguon = " << gt.vt;
	cout << endl;
	cout << "Ky hieu chuyen = "; 
	fflush(stdin);
    cin.get(gt.kh);
	gt.kh = toupper(gt.kh);
	cout << "Ky hieu chuyen = " << gt.kh;
	cout << endl;
	cout << "Trang thai dich = "; 
	fflush(stdin);
    cin.get(gt.vp);
	gt.vp = toupper(gt.vp);
	cout << "Trang thai dich = " << gt.vp;
	cout << endl;
	cout << endl;
}

bool timdce(OTMA gt) // tim ra dich chuyen epxilon
{
	if ((gt.vt != gt.vp) && (gt.kh == '*')) return true;
	return false;
}

bool baccau(OTMA x, OTMA gt)
{
	if (gt.vp == x.vt) return true;
	return false;
} 

bool thuanhan(char p, char *f, int q)// tim xem trang thai thua nhan co thuoc trong dich chuyen hay k
{
	for (int i = 0; i<q; i++)
	if (f[i] == p) return true;
	return false;
}

bool thua_nhan(char *f, int q, OTMA gt)// loai bo truong hop ca ve trai va vp deu la tt thua nhan va gap e
{
	for (int i = 0; i<q; i++)
	if ((gt.vp == f[i]) && (gt.kh == '*') && (thuanhan(gt.vt, f, q) == false)) return true;
	return false;
}

void nhap(OTMA *p, int &dc, char *f, int &q, char *a, int &n, char *b, int &m, char s)
{
	cout << "moi ban nhap otomat M=(X, Q, dc, q0, F ) : " << endl;
	cout << "quy uoc : " << endl;
	cout << "1. bo chu vao la ki hieu chu thuong. " << endl;
	cout << "2. tap huu han trang thai la tap cac ki hieu chu hoa." << endl;
	cout << " - - - - - - - - - - - - - - - - - - - - - - - -  
";
	cout << endl;
	cout << "ban muon nhap may ki hieu trong bo chu vao X ? " << endl;
	cout << "nhap n =  ";
	cin >> n;
	cout << endl;
	for (int i = 0; i<n; i++)
	{
		cout << endl;
		cout << "ki hieu vao thu " << i + 1 << " : ";
		cin >> a[i];
		a[i] = tolower(a[i]);
		cout << "ki hieu vao thu " << i + 1 << " la : " << a[i];
		cout << endl;
	}

	cout << endl;

	cout << " - - - - - - - - - - - - - - - - - - - - - - - -  
";
	cout << endl;
	cout << "ban muon nhap may tap huu han trang thai Q ? " << endl;
	cout << "nhap m =";
	cin >> m;
	cout << endl;
	for (int j = 0; j<m; j++)
	{
		cout << endl;
		cout << "trang thai thu  " << j + 1 << " : ";
		cin >> b[j];
		b[j] = toupper(b[j]);
		cout << "trang thai thu  " << j + 1 << " la : " << b[j];
		cout << endl;
	}
	cout << endl;

	cout << " - - - - - - - - - - - - - - - - - - - - - - - -  
";
	cout << endl;
	cout << "ban muon nhap bao nhieu dich chuyen ? ( epsilon nhap la * ) " << endl;
	cout << "So luong dich chuyen : "; cin >> dc;
	for (int i = 0; i<dc; i++)
	{
		cout << "Dich chuyen thu " << i + 1 << " : ";
		cout << endl;
		nhapdc(p[i]);
	}

	cout << " - - - - - - - - - - - - - - - - - - - - - - - -  
";
	cout << endl;
	cout << " nhap ki hieu bat dau q0 ! ";
	cin >> s;
	s = toupper(s);
	cout << " ki hieu bat dau la : " << s;
	cout << endl;

	cout << " - - - - - - - - - - - - - - - - - - - - - - - -  
";
	cout << endl;
	cout << " nhap bao nhieu trang thai thua nhan F ? ";
	cin >> q;
	for (int i = 0; i<q; i++)
	{
		cout << " trang thai thua nhan thu " << i + 1 << "la : ";
		cin >> f[i];
		f[i] = toupper(f[i]);
		cout << endl;
		cout << " trang thai thua nhan thu " << i + 1 << "la : " << f[i];
		cout << endl;
	}
}
void show_dc(OTMA *p, int dc, char *f, int q)
{
	cout << "________________________________________________________" << endl;
	cout << "Otomat moi co ham dich chuyen nhu sau:" << endl;
	for (int i = 0; i<dc; i++)
	if (p[i].kh != '*')
	{
		show(p[i]);
		cout << endl;
	}
	cout << "Cac trang thai thua nhan la: " << endl << "			";
	for (int i = 0; i<q; i++) cout << f[i] << ' ';
}
void thuchien(OTMA *p, int &dc, char *f, int &q)
{
	OTMA P;
	for (int i = 0; i<dc; i++)
	{
		if (timdce(p[i]) == true)
		{
			for (int j = 0; j<dc; j++)
			if (baccau(p[j], p[i]) == true)
			{
				P = cong(p[i], p[j]);
				if (lap(p, P, dc) == false)
				{
					p[dc] = P;
					dc += 1;
				}
			}
		}
		if (thua_nhan(f, q, p[i]) == true)
		{
			f[q] = p[i].vt;
			q += 1;
		}
	}
}
OTMA cong(OTMA x, OTMA y)
{
	OTMA kq;
	kq.kh = (x.kh)+(y.kh);
	kq.vp = (x.vp)+(y.vp);
	kq.vt = x.vt;
	return kq;
}
void show(OTMA gt)
{
	cout << "			 dich chuyen : " << gt.vt << ","<<gt.kh << "-> " << gt.vp;
}