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代码之前先说一下头文件：
<iostream><string><vector>/分割/<algorithm><cctype>/检查/<sstream>/分割/
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#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<cctype>
#include<sstream>
using namespace std;
int main(){
	string s="triangle";
	while (true){
		string way;
		cin >> way;
		if (way=="quit") break;
		else if (way=="查找"){
			string item;
			cin >> item;
			cout << s.find(item) << endl;
		}
		else if (way=="子串"){
			int start, len;
			cin >> start >> len;
			cout << s.substr(start, len) << endl;
		}
		else if (way=="替换"){
			int start, len;
			string item;
			cin >> start >> len >> item;
			s.replace(start, len, item);
		}
		else if (way=="添加"){
			string item;
			cin >> item;
			s.append(item);
		}
		else if (way=="插入"){
			int start;
			string item;
			cin >> start >> item;
			s.insert(start, item);
		}
		else if (way=="大小"){
			string type;
			cin >> type;
			if (type=="大写") transform(s.begin(), s.end(), s.begin(), ::toupper);
			else if (type=="小写") transform(s.begin(), s.end(), s.begin(), ::tolower);
		}
		else if (way=="检查"){
			string type;
			cin >> type;
			if (type=="空格"){
				int i=0;
				while (isspace(s[i])) i++;
				cout << (i == s.size()) << endl;
			}
			else if (type=="小写"){
				int i=0;
				while (islower(s[i])) i++;
				cout << (i == s.size()) << endl;
			}
			else if (type=="大写"){
				int i=0;
				while (isupper(s[i])) i++;
				cout << (i == s.size()) << endl;
			}
			else if (type=="数字"){
				int i=0;
				while (isdigit(s[i])) i++;
				cout << (i == s.size()) << endl;
			}
			else if (type=="字母"){
				int i=0;
				while (isalpha(s[i])) i++;
				cout << (i == s.size()) << endl;
			}
			else if (type=="字符"){
				int i=0;
				while (isalnum(s[i])) i++;
				cout << (i == s.size()) << endl;
			}
		}
		else if (way=="修改"){
			int index;
			char item;
			cin >> index >> item;
			s[index] = item;
		}
		else if (way=="分割"){
			char item;
			cin >> item;
			stringstream ss; ss<<s;
			vector<string> sits;
			string f;
			while (getline(ss,f,item)) sits.push_back(f);
			for (int i=0; i<sits.size(); i++) cout << sits[i] << " ";
			cout << endl;
		}
	}
	cout << s << endl;
	return 0;
}