c++关于字符串的读入和截取

#include<iostream>
#include<string>
#include<vector>
using namespace std;
vector<string> splitEx(const string& src, string separate_character)
{
vector<string> strs;

int separate_characterLen = separate_character.size();//分割字符串的长度,这样就可以支持如“,,”多字符串的分隔符
int lastPosition = 0, index = -1;
while (-1 != (index = src.find(separate_character, lastPosition)))
{
strs.push_back(src.substr(lastPosition, index - lastPosition));
lastPosition = index + separate_characterLen;
}
string lastString = src.substr(lastPosition);//截取最后一个分隔符后的内容
if (!lastString.empty())
strs.push_back(lastString);//如果最后一个分隔符后还有内容就入队
return strs;
}

int main()
{
/*
string s;
string sum;
while (cin >> s){
sum += s + " ";
if (cin.get() == '\n')
break;
}
cout << sum << endl;
*/
int tpp = 1;
string str;
do{
string s;
string temp;
cout << "输入一行字符串：\n";
while (cin >> s){
temp += s + " ";
if (cin.get() == '\n')
break;
}
cout << "继续输入请按1";
cout << temp << endl;
str = temp;
cin >> tpp;

} while (tpp==1);

//string str;
/*
int count;//单词个数
int i, j;
*/

//cout << "输入一行字符串：\n";
//getline(cin, str);

/*
for (count = 0, j = str.size(), i = 0; i<j;)
{
while (str[i] == ' '&&i<j) i++;
if (i<j) count++;
while (str[i] != ' '&&i<j) i++;
}
cout << "j=" << str.size() << endl;
cout << "输入的字符串为：\n" << str << endl;
cout << "字符串中包含的单词数为：" << count << endl;
*/

string del = " ";
vector<string> strs = splitEx(str, del);
//cout << "strsSize=" << strs.size() << endl;
cout << "输入的字符串为：\n" << str << endl;
cout << "字符串中包含的单词数为：" << strs.size() << endl;
//int a,b,c,d;
unsigned int i = strs.size()-1;
while (i >=0)
//for (unsigned int i = 0; i < strs.size(); i++)
{
int j = 1;
int a = atoi(strs[i].c_str());
int b = atoi(strs[i-1].c_str());
int c = atoi(strs[i - 2].c_str());
int d = atoi(strs[i-3].c_str());
int cc = atoi(strs[j+2].c_str());
//cout <<b+1 << endl;
if (a == b && c == d){
cout << "yes" << endl;
break;
}

else
{
cout << "no" << endl;
break;
}
//i -= 3;
}

cout << endl;
system("pause");
return 0;

}