构造函数-初始化列表
#include <iostream>using namespace std;
class Person {
public:
string name;
int age;
string gender;
int score;
//Person() {
// name = "";
// age = 0;
// gender = "";
// score = 0;
//}
Person() :name(""), age(0), gender(""), score(0) { }//初始化列表的写法
Person(string n, int a, string g, int s) :name(n), age(a), gender(g), score(s) { }
//如果出现了形参的名字和属性名字相同的情况，系统会自动的去识别参数和属性
Person(string name, int age, string gender) :name(name), age(age), gender(gender) { }
};
int main() {
Person xiaoming("xiaoming", 19, "male", 99);
cout << xiaoming.name << endl;
cout << xiaoming.age << endl;
cout << xiaoming.gender << endl;
cout << xiaoming.score << endl;
Person xiaobai("xiao.bai", 19, "male");
cout << xiaobai.name << endl;
cout << xiaobai.age << endl;
cout << xiaobai.gender << endl;
return 0;
} 你提供的代码缺少了 #include <iostream> 和一个完整的输出语句。我们来补充并修正一下代码：
#include <iostream>
#include <string>
using namespace std;
class Person {
public:
string name;
int age;
string gender;
int score;
// 默认构造函数
Person() : name(""), age(0), gender(""), score(0) {}
// 带参数的构造函数
Person(string n, int a, string g, int s) : name(n), age(a), gender(g), score(s) {}
// 带部分参数的构造函数
Person(string name, int age, string gender) : name(name), age(age), gender(gender), score(0) {}
};
int main() {
Person xiaoming("xiaoming", 19, "male", 99);
cout << "Name: " << xiaoming.name << ", Age: " << xiaoming.age
<< ", Gender: " << xiaoming.gender << ", Score: " << xiaoming.score << endl;
return 0;
}
这个代码会正确输出小明的信息。
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