面向对象程序设计

课程名称：面向对象程序设计

授课教师：霍宇驰

好像是计院必修课程吧，提前一学期在大二秋冬学期就选上了这门课，希望本学期不会死掉。

Introduction

The C language

• Strengths
  • Efficient programs
  • Direct access to machine, suitable for OS and ES
  • Flexible
• Weakness
  • Insufficient type checking
  • Unsuitable for high-level applications
  • No direct support for oop

C++ improvements

• References
• Operator overloading
• Data abstraction
• Access control
• …

Using Objects

Like the string class

#include<string>

string name = "Alice"

cout<<name;

string anotherName = name;

File I/O

#include<ifstream>
#inclued<ofstream>
int main(){
    ofstream File1("C:\\test.txt");
    ...
}

Pointers to Objects

string s = "hello";
string *ps = &s;
(*ps).length();//*: get the object
ps->length()//->: call the function

Reference

int x;
int &y=x;
y=5;//change the value of x
int f(int &z){
    z=3;
}
f(x)//change the value of x