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; }