CirclQ, C++ (gcc) - rextester

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//g++  7.4.0
//////////////////////////////////////////////////////////////////////////////
//Circular Queue(templated Queue)
//this code is created by Rezaul Hoque on August 29,2022;update: 18:08
//contact:jewelmrh@yahoo.com;Dhaka,Bangladesh;https://rezaulhoque.wordpress.com,https://hoquestake.blogspot.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
/////////////////////////////////////////////////////////////////////////////

#include <iostream>
using namespace std;
template <class T>
class Q{
public:
Q(int s=100) : size(s+1) , first (-1),last (-1) { data = new T[size ];}
~Q(){ delete [] data;}

int isEmpty() const {
if(first==-1) 
        return 1;
  else
        return 0;
}
int isFull() const {
 if(first==0 && last == size-1) {return 1;}
if(first==last+1) {return 1;}
return 0;
}

void enqueue(const T& x){ 
if(isFull()){
std::cout<<"Queue is full\n";}
else {
if(first==-1) first=0;
last=(last+1)%size;
data [last]=x; }

}

T dequeue(){
T x;
if(isEmpty()){
std::cout<<"Queue is empty. \n";
return -1;
}
else {
 x= data[first ];
if(first == last)
{
  first = -1; last=-1;
}
else 
    { first =( first +1)%size;}
return x;
 }
}
int size, first, last;
T* data;
};
int main ()
{
Q<char> q1(21);

q1.enqueue('Q');
q1.enqueue('U');
q1.enqueue('E');
q1.enqueue('U');
q1.enqueue('E');
q1.enqueue('\n');
q1.enqueue('A');
q1.enqueue('u');
q1.enqueue('g');
q1.enqueue(' ');
q1.enqueue('2');
q1.enqueue('9');
q1.enqueue(',');
q1.enqueue('2');
q1.enqueue('0');
q1.enqueue('2');
q1.enqueue('2');

for(int i=q1.first;i<=q1.last;i++){
cout<<q1.data[i];
}

return 0;
}

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Compilation time: 0.31 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,55 sec