本文共 978 字，大约阅读时间需要 3 分钟。

黑马250

#include #include #include #include using namespace std; //统计内置数据类型 class greater5 { public: bool operator()(int val) { return val > 5; } }; void test01() { vectorv; for (int i = 0; i < 20; i++) { v.push_back(i); } int num = count_if(v.begin(), v.end(),greater5()); cout << “查找大于5元素的个数” << num; } class person { public: person(string name, int age) { m_name = name; m_age = age; } bool operator==(const person& p) { if (p.m_age == this->m_age) { return true; } else { return false; } } string m_name; int m_age; }; class greater20 { public: bool operator()(const person &p) { return p.m_age > 20; } }; //自定义数据类型 void test02() { vectorv; person p1(“aa”, 10); person p2(“bb”, 20); person p3(“cc”, 30); person p4(“dd”, 30); person p5(“ee”, 20);

person p("pp", 30);v.push_back(p1);v.push_back(p2);v.push_back(p3);v.push_back(p4);v.push_back(p5);v.push_back(p);int num = count_if(v.begin(), v.end(),greater20());cout << "岁数大于20 人的个数：" << num << endl;

}

int main() { test02(); }

转载地址：https://blog.csdn.net/qq_43752920/article/details/120548915 如侵犯您的版权，请留言回复原文章的地址，我们会给您删除此文章，给您带来不便请您谅解！