customsort.cpp

适合初学者学习以及程序员回顾

#include <string>
#include <iostream>
#include <algorithm>
using namespace std;

bool nocase_compare(char c1,char c2)
{
	return toupper(c1)==toupper(c2);
}

int main()
{
	string s1("This is a string");
	string s2("STRING");
	
	if(s1.size()==s2.size() &&		//确保两字串相同,否则，
									//equal可能会导致无法预料的结果
		equal(s1.begin(),s1.end(),	//源串
		s2.begin(),					//第二字串
		nocase_compare))			//比较方法
	{
		cout<<"the strings are equal"<<endl;
	}
	else
	{
		cout<<"the strings are not equal"<<endl;
	}

	string::iterator pos;
	pos=search(s1.begin(),s1.end(),		//源串
				s2.begin(),s2.end(),	//需要查找的字串
				nocase_compare);		
	if(pos==s1.end())
	{
		cout<<"s2 is not a substringof s1"<<endl;
	}
	else
	{
		cout<<'"'<<s2<<"\" is a substring of \""
			<<s1<<"\"(at index " << pos-s1.begin()<<")"
			<<endl;
	}
}