UVa1593_Allgnment_Of_Code

 /**
     start:    integer;    // begins hear
  stop: integer;  // ends here
   s: string;
  c:  char;  // temp
 **/                           //测试数据
 #include<iostream>
 #include<sstream>
 #include<string>
 #include<vector>
 using namespace std;

 vector<string> txt[];
 string code, tmp;
 int max_len[];            //储存每列最大的字符串长度 

 void print(const string& s, int len, char extra)
 {
     cout << s;
     for (unsigned int i = ; i <= len-s.length(); i++)
         cout << extra;
 }

 int main()
 {
     int cols = , row = ;          //列数, 行数
     while (getline(cin, code))
     {
         istringstream ss(code);     //istringstream从string对象中读取
         while (ss >> tmp) {
             max_len[cols] = max(max_len[cols], (int)tmp.size()); //求出每行的每列上的最大字符串长度
             cols++;                                 //列数++
             txt[row].push_back(tmp);
         }
         row++; cols = ;                            //行数++, 列数归零
     }
     for (int i = ; i < row; i++)
     {
         unsigned int j = ;
         for ( ; j < txt[i].size() - ; j++)
         {
             print(txt[i][j], max_len[j], ' '); //输出单个字符串，长度不够的输出空格
         }
         cout << txt[i][j] << endl;             //每行每列
     }
     return ;
 }

这里有一篇关于:istringstream, ostringstream, stringstream的文章，感觉不错.

http://www.cnblogs.com/gamesky/archive/2013/01/09/2852356.html