#include<stdexcept>

#include<string>

#include<cstdlib>

#include<cstdio>

#include<algorithm>

#include<iostream>

#include<ctime>

#include<queue>

using namespace std;

long get_a_target_long()

{

	long target = 0;

	cout<<"target(0~"<<RAND_MAX<<"):";

	cin>>target;

	return target;

}

string get_a_target_string()

{

	long target = 0;

	char buf[10];

	cout<<"target(0~"<<RAND_MAX<<"):";

	cin>>target;

	snprintf(buf, 10, "%ld", target);

	return string(buf);

}

int compareLongs(const void* a, const void* b)

{

	return (*(long*)a - *(long*)b);

}

int compareStrings(const void *a, const void *b)

{

	if(*(string*)a > *(string*)b)

		return 1;

	else if(*(string*)a < *(string*)b)

		return -1;

	else

		return 0;

}

void test_queue(long& value)

{

	cout << "\ntest_queue().......... \n";

	queue<string> c;

	char buf[10];

	clock_t timeStart = clock();

	for(long i=0; i< value; ++i)

	{

		try {

			snprintf(buf, 10, "%d", rand());

			c.push(string(buf));

		}

		catch(exception& p) {

			cout << "i=" << i << " " << p.what() << endl;

			abort();

		}

	}

	cout << "milli-seconds : " << (clock()-timeStart) << endl;

	cout << "queue.size()= " << c.size() << endl;//队列大小

	cout << "queue.front()= " << c.front() << endl;	//头部元素

	cout << "queue.back()= " << c.back() << endl;		//尾部元素

	c.pop();　　　　　　　　　　　　　　　　　　　　　　　　　　//删除front元素

	cout << "queue.size()= " << c.size() << endl;

	cout << "queue.front()= " << c.front() << endl;

	cout << "queue.back()= " << c.back() << endl;

}

int main()

{

	long int value;

	cout<<"how many elements: ";

	cin>>value;

	test_queue(value);

	return 0;

}