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c++find函数用法

头文件

#include <algorithm>

函数实现

template<class InputIterator, class T>InputIterator find (InputIterator first, InputIterator last, const T& val){  while (first!=last)   {     if (*first==val) return first;     ++first;   }    return last;}

例1(vector)

#include <iostream>#include <algorithm>#include <vector>using namespace std;int main(){    vector<string> m;    m.push_back("hello");    m.push_back("hello2");    m.push_back("hello3");    if (find(m.begin(), m.end(), "hello") == m.end())        cout << "no" << endl;    else        cout << "yes" << endl;}

例2(set)

#include <iostream>#include <algorithm>#include <string>#include <set>using namespace std;int main(){    set<string> m;    m.insert("hello");    m.insert("hello2");    m.insert("hello3");    if (find(m.begin(), m.end(), "hello") == m.end())        cout << "no" << endl;    else        cout << "yes" << endl;}

 

1:set自身有个find函数,举例如下:

#include <iostream>#include <algorithm>#include <string>#include <set>using namespace std;int main(){    set<string> m;    m.insert("hello");    m.insert("hello2");    m.insert("hello3");    if (find(m.begin(), m.end(), "hello") == m.end())        cout << "no" << endl;    else        cout << "yes" << endl;}

2:string自身有个find函数,举例如下:

#include <iostream>#include <algorithm>#include <string>using namespace std;int main(){    string s = "helllo";    if (s.find("e") == string::npos)  //yes        cout << "no" << endl;    else        cout << "yes" << endl;    if (s.find("z") == string::npos)  //no        cout << "no" << endl;    else        cout << "yes" << endl;}

 

c++find函数用法