看如下代碼：?

#include<iostream> using namespace std;#include<string>//結構體 struct Student {string name;int age;int score;}st3;//值傳遞 void printStufdents(struct Student st2) {cout << "子函數" << endl;st2.age = 150;cout << "名字：" << st2.name << " 年齡：" << st2.age << " 分數：" << st2.score << endl; }//指針傳遞只占四個字節 節省內存空間 而且不會復制新的副本出來 void printStufdents(struct Student *s) {cout << "子函數" << endl;s->age = 150;cout << "名字：" << s->name << " 年齡：" << s->age << " 分數：" << s->score << endl; }int main() {struct Student st2 = { "張三豐",120,70 };cout << "名字" << st2.name << "年齡" << st2.age << "分數" << st2.score<< endl;printStufdents(st2);system("pause"); }

1，地址傳遞只占四個字節 ?節省內存空間 ?而且不會復制新的副本出來

2，地址傳遞有個問題，會改變地址的值，為了防止誤操作，我們引入了const關鍵字修飾指針

#include<iostream> using namespace std;#include<string>//結構體 struct Student {string name;int age;int score; }st3;void printStufdents(struct Student st2) {cout << "子函數" << endl;st2.age = 150;cout << "名字：" << st2.name << " 年齡：" << st2.age << " 分數：" << st2.score << endl; }//指針傳遞只占四個字節 節省內存空間 而且不會復制新的副本出來 void printStufdents(const struct Student *s) {cout << "子函數" << endl;s->age = 150;cout << "名字：" << s->name << " 年齡：" << s->age << " 分數：" << s->score << endl; }int main() {struct Student st2 = { "張三豐",120,70 };cout << "名字" << st2.name << "年齡" << st2.age << "分數" << st2.score<< endl;printStufdents(st2);system("pause"); }

?

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