c++沉思录中 对字符串进行围边 横向连接 竖向连接操作的练习

// MyPics.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

#include <string>

#include <iostream>

#include <vector>

using namespace std;

string::size_type width(const vector<string>& v)

{

	string::size_type maxLen = 0;

	for (vector<string>::const_iterator it = v.begin(); it != v.end(); it++) {

		if (maxLen < it->size())

			maxLen = it->size();

	}

	return maxLen;

}

vector<string> frame(const vector<string>& p) {

	vector<string> v;

	string::size_type maxLen = width(p);

	string s(maxLen + 4, '*');

	v.push_back(s);

	for (vector<string>::const_iterator it = p.begin();

		it != p.end(); it++){

		v.push_back("* " + *it + string(maxLen - it->size(),' ') + " *");

	}

	v.push_back(s);

	return v;

}

vector<string> hcat(const vector<string>& right,

	const vector<string>& left) {

	vector<string> v;

	string::size_type rightMaxLen = width(right);

	int index = 0;

	while (index < right.size() || index < left.size()) {

		string s;

		if (index < right.size()) {

			s = right[index];

			s += string(rightMaxLen - right[index].size(),' ' );

		}

		else

			s = string(rightMaxLen,' ');

		if (index < left.size())

			s += left[index];

		index++;

		v.push_back(s);

	}

	return v;

}

vector<string> vcat(const vector<string>& top,

	const vector<string>& bottom) {

	vector<string> v = top;

	for (vector<string>::const_iterator it = bottom.begin();

		it != bottom.end(); it++)

	{

		v.push_back(*it);

	}

	return v;

}

int main()

{

	vector<string> p;

	p.push_back("this is an");

	p.push_back("example");

	p.push_back("to");

	p.push_back("illustrate");

	p.push_back("framing");

	vector<string> v = frame(p);

	for (vector<string>::const_iterator it = v.begin();

		it != v.end(); it++) {

		std::cout << *it << std::endl;

	}

	std::cout << std::endl << std::endl;

	v.clear();

	v = vcat(p,frame(p));

	for (vector<string>::const_iterator it = v.begin();

		it != v.end(); it++) {

		std::cout << *it << std::endl;

	}

	std::cout << std::endl << std::endl;

	v.clear();

	v = hcat(p, frame(p));

	for (vector<string>::const_iterator it = v.begin();

		it != v.end(); it++) {

		std::cout << *it << std::endl;

	}

	std::cout << std::endl << std::endl;

	v.clear();

	v = hcat(frame(p),p);

	for (vector<string>::const_iterator it = v.begin();

		it != v.end(); it++) {

		std::cout << *it << std::endl;

	}

    return 0;

}