小甲鱼C++快速入门p7课后题

 

#include <iostream>
#include <string>
using namespace std;
int main ()
{
	string str("hello word hello my dear master!");
	string str_1,str_2,str_3;

	//cout<<"请输入一段字符"<<endl;
	//cin>>str;
	
  //提取字串 
	cout<<"它的一段子串是："<<endl;
	str_1=str.substr(1,3); 
	str_2=str.substr(2,3);
	cout<<"str_1 = "<<str_1<<" "<<"str_2 = "<<str_2<<endl; 
	
  // 比较字符串
	cout<<"str_1与str_2进行比较"<<endl;
	if( str_1 > str_2)
	cout<<"str_1 > str_2"<<endl;
	else
	cout<<"str_1 <= str_2"<<endl;
	
	//添加字符串
	cout<<"请输入你要添加的字符串："<<endl;
	char temp[200 ]={'\0'}; 
	cin.getline(temp,200);
	cout<<"添加后的结果:str = "<<str.append(temp)<<endl;
	//搜索字符串
	cout<<"请输入你要搜索的字符串："<<endl;
	cin.getline(temp,200);
	if(str.find(temp)!=-1)
	{
		cout<<"存在！"<<endl; 
	}
	else
	{
		cout<<"不存在！"<<endl; 
	}
  return 0;
}