C++物件数组的常用方法介绍

以下代码建立了一个物件数组Student，并展示了如何计算物件数组的长度，如何从物件数组中找到特定的对象，如何根据数组的不同参数进行排序，以及如何找到最大和最小值。

#include <iostream>
#include <algorithm>using namespace std;class Student{public:string Name;int Age;char Gender;float ProgrammingGrade;Student(string name, int age, char gender, float programmingGrade){Name = name;Age = age;Gender = gender;ProgrammingGrade = programmingGrade;}
};bool compareByGrade(const Student& s1, const Student& s2){return s1.ProgrammingGrade < s2.ProgrammingGrade;
}bool compareByName(const Student& s1, const Student& s2){return s1.Name < s2.Name;
}int main(){Student students[5] = {{"John", 20, 'm', 9},{"Bob", 21, 'm', 8},{"Alice", 19, 'm', 9.2},{"Eve", 20, 'm', 8.5},{"Jefferey", 23, 'm', 7.2}};// 如何找到物件数组的长度int arrSize = *(&students + 1) - students;// cout << "The length is: " << arrSize << endl;// Searchfor(int i = 0; i < arrSize; i++){if(students[i].Name == "Alice"){cout << "Alice found at index: " << i << endl;break;}}cout << "<--------------------------------------------->" << endl;// Sortsort(students, students + arrSize, compareByGrade);// sort(students, students + arrSize, compareByName);for(int i = 0; i < arrSize; i++){cout << students[i].Name << " " << students[i].ProgrammingGrade << " " << endl;}cout << "<--------------------------------------------->" << endl;// Max and MinStudent* maxGradeStudent = max_element(students, students + arrSize, compareByGrade);cout << "The max grade student is: " << maxGradeStudent->Name << " " << endl;Student* minGradeStudent = min_element(students, students + arrSize, compareByGrade);cout << "The min grade student is: " << minGradeStudent->Name << " " << endl;return 0;
}

Alice found at index: 2
<--------------------------------------------->
Jefferey 7.2
Bob 8
Eve 8.5
John 9
Alice 9.2
<--------------------------------------------->
The max grade student is: Alice
The min grade student is: Jefferey