#include <dos.h>
#include <stdlib.h>
#include <iostream.h>
#include <conio.h>
#include <windows.h>
#define MAX 5 // MAXIMUM CONTENTS IN QUEUE
class task {
public:
virtual void dotask() {}
task() {}
int exists;
};
class notep : public task {
public:
notep() { exists = 1; }
void dotask() { system("notepad"); }
};
class regt : public task {
public:
regt() { exists = 1; }
void dotask() { system("regedit"); }
};
class winex : public task {
public:
winex() { exists = 1; }
void dotask() { system("explorer"); }
};
class Bep : public task {
public:
Bep() { exists = 1; }
void dotask() { cout << "\a"; }
};
class MsBox : public task {
private:
char* text;
char* caption;
int style;
public:
MsBox(char* ext, char* cap, int no) {
text = ext;
caption = cap;
exists = 1;
style = no;
}
void dotask() { MessageBox(0, text, caption, style); }
};
class queue {
private:
task* t[MAX];
int al;
int dl;
public:
int opt, opt1, a;
char te[255], capt[40];
queue() {
dl = -1;
al = -1;
}
void del() {
task* tmp;
if (dl == -1) {
cout << "Queue is Empty";
sleep(2);
} else {
t[dl]->exists = 0;
for (int j = 0; j <= al; j++) {
if ((j + 1) <= al) {
tmp = t[j + 1];
t[j] = tmp;
} else {
t[al]->exists = 0;
al--;
if (al == -1)
dl = -1;
else
dl = 0;
}
}
}
}
void menu() {
clrscr();
cout << "1) Add Task \n2)Execute Tasks\n3)Exit Program\n";
// int opt;
cin >> opt;
switch (opt) {
case 1:
clrscr();
cout << "1) Open Notepad\n";
cout << "2) Open Explorer\n"
<< "3) Open Registry\n"
<< "4) Sound a Beep\n"
<< "5) MessageBox API\n"
<< "6) Back\n";
cin >> opt1;
if (opt1 != 6)
add(opt1);
break;
case 2:
if (al != -1 && dl != -1) {
for (int k = 0; k <= al; k++) {
if (t[k]->exists == 1)
t[k]->dotask();
t[k]->exists = 0;
}
al = dl = -1;
} else {
cout << "Queue is Empty";
sleep(3);
}
break;
case 3:
exit(0);
break;
}
}
void add(int item) {
if (dl == -1 && al == -1) {
dl++;
al++;
} else {
al++;
if (al < max) {
} else {
cout << "Queue is Full\n";
al--;
sleep(3);
return;
}
}
switch (item) {
case 1:
t[al] = new notep;
break;
case 2:
t[al] = new winex;
break;
case 3:
t[al] = new regt;
break;
case 4:
t[al] = new Bep;
break;
case 5:
cout << "\n Enter Style Number:";
cin >> a;
t[al] = new MsBox("Task Performed.", "Queue Implementation", a);
break;
default:
cout << "Programming Error"; // No Possibility of this executing
};
}
};
void main() {
queue a;
while (1) {
a.menu();
}
}
