C++ 标准模板库STL 队列 queue 使用方法与应用介绍（一） (二)

#include
#include
#include
using namespace std;
void test_empty()
{
queue myqueue;
int sum (0);

for (int i=1;i<=10;i++) myqueue.push(i);

while (!myqueue.empty())
{
sum += myqueue.front();
myqueue.pop();
}
cout << "total: " << sum << endl;
}//运行结果： total： 55
void test_pop()
{
queue myqueue;
int myint;

cout << "\nPlease enter some integers (enter 0 to end):\n";

do
{
cin >> myint;
myqueue.push (myint);
} while (myint);

cout << "myqueue contains: ";
while (!myqueue.empty())
{
cout << " " << myqueue.front();
myqueue.pop();
}
}
/********
运行结果：
Please enter some integers (enter 0 to end):
512
605
420
517
532
0
myqueue contains: 512 605 420 517 532 0
********/
void test_size()
{
queue myints;
cout << "0. size: " << (int) myints.size() << endl;

for (int i=0; i<5; i++) myints.push(i);
cout << "1. size: " << (int) myints.size() << endl;

myints.pop();
cout << "2. size: " << (int) myints.size() << endl;
}
/****
运行结果：
0. size: 0
1. size: 5
2. size: 4
****/
int main()
{
test_empty();
cout<<"\n***********************************************\n";
test_size();
cout<<"\n***********************************************\n";
test_pop();
cout<<"\n***********************************************\n";
queue q;

// insert three elements into the queue
q.push("These ");
q.push("are ");
q.push("more than ");
//cout << "number of elements in the queue: " << q.size()<< endl;

// read and print two elements from the queue
cout << q.front();
q.pop();
cout << q.front();
q.pop();
//cout << "number of elements in the queue: " << q.size()<< endl;

// insert two new elements
q.push("four ");
q.push("words!");
//cout << "\nnumber of elements in the queue: " << q.size()<< endl;
// skip one element
q.pop();

// read and print two elements
cout << q.front();
q.pop();
cout << q.front() << endl;
q.pop();

// print number of elements in the queue
cout << "number of elements in the queue: " << q.size()<< endl;
}
/*******
*运行结果：
total: 55

***********************************************
0. size: 0
1. size: 5
2. size: 4

***********************************************

Please enter some integers (enter 0 to end):
512
605
420
517
532
0
myqueue contains: 512 605 420 517 532 0
***********************************************
These are four words!
number of elements in the queue: 0

Process returned 0 (0x0) execution time : 33.512 s
Press any key to continue.

********/