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

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// 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;
}