exe3.13.cpp

C++ primer 4th edition 部分习题解答 前十章

#include<iostream>
#include<string>
#include<vector>
using namespace std;

int main()
{
	vector <int> vec1,vec2;
	bool isEnd=false;
	for (vector<int>::size_type xi=0;xi!=11;xi++)
	{
		vec1.push_back(xi*10+10);
	}
	
	for (vector<int>::size_type xi=0;xi<=vec1.size();xi+=2)
	{
		if (xi+1==vec1.size())
		{
			cout<<vec1[xi]<<endl<<"That's the end."<<endl;
			isEnd=true;
		}
		else
		{
			cout<<vec1[xi]+vec1[xi+1]<<endl;
		}
	}
	if (!isEnd)
	{
		cout<<"That's the end."<<endl;	
	}
	vec2=vec1;
	while (vec2.size()!=0)
	{
		if (vec2.size()==1)
		{
			cout<<vec2[0]<<endl<<"That's the end."<<endl;
			isEnd=true;
			vec2.erase(vec2.begin());
		}
		else
		{
			cout<<vec2[0]+vec2[vec2.size()-1]<<endl;
			vec2.erase(vec2.begin());
			vec2.pop_back();
//			vec2.erase(vec2[xi]);
		}
	}
	if (!isEnd)
	{
		cout<<"That's the end."<<endl;	
	}
	cout<<vec1.size()<<endl;
	return 0;
}