5-7.cpp

Accelerated C++ 课后练习题 本人自己完成、可供参考

#include<iostream>
#include<string>
#include<vector>
#include<cctype>
using namespace std;
/**/
vector<string> split(const string& s)
{
	vector<string> ret;
	typedef string::size_type string_size;
	string_size i=0;

	//ivarinant: we have processed characters [original value of i, i)
	while(i!=s.size())
	{
		//ignore leading blanks
		//invariant: characters in range [original i, current i) are all spaces
		while(i!=s.size()&&isspace(s[i]))
			++i;
		//find end of next word
		string_size j=i;
		//invariant: none of the characters in range [original j,current j)is a space
		while(j!=s.size()&&!isspace(s[j]))
			j++;
		//if we found some nonwhitespace characters
		if(i!=j)
		{
			//copy from s starting at i and taking j-i chars
			ret.push_back(s.substr(i,j-i));
			i=j;
		}
	}
	return ret;
}

string::size_type width(const vector<string>& v)
{
	string::size_type maxlen=0;
	for(vector<string>::size_type i=0;i!=v.size();++i)
		maxlen=_MAX(maxlen,v[i].size());
	return maxlen;
}

vector<string> frame(vector<string>& v)
{
	vector<string> ret;
	string::size_type maxlen=width(v);
	string border(maxlen+4,'*');

	//write the top border
	ret.push_back(border);

	//write each interior row, bordered by asterisk and a space
	for(vector<string>::size_type i=0;i!=v.size();++i)
	{
		vector<string>::size_type l=maxlen-v[i].size();
		ret.push_back("* " + string(l/2,' ')+ v[i] + string(l-l/2,' ') + " *");
	}

	//write the bottom  border
	ret.push_back(border);

    return ret;

	
}
void frame1(vector<string>& v)
{
	 v=frame(v);
}
int main()
{
	string s;
	getline(cin,s);					//int put a line string
	vector<string> v=split(s);		//split string to words
	vector<string> w=frame(v);		//add a border to words

	for(vector<string>::size_type i=0;i<w.size();++i)		//output
		cout<<w[i]<<endl;

	frame1(v);
	for(i=0;i<v.size();++i)
		cout<<v[i]<<endl;

	return 0;	
}