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/**

* 常量就是不变量，包括整型常量、浮点常量、布尔常量、字符常量

* 字符串常量。定义常量两种方式：

* #define预处理和 const关键字

#include <iostream>

using namespace std;

#define LENGTH 10

#define WIDTH 5

#define NEWLINE '\n'

int main()

{

int area = 0;

const int A = 10;

const int B = 20;

area = LENGTH * WIDTH;

cout << area;

cout << NEWLINE;

cout << "const A*B = " << A*B << NEWLINE;

return 0;

}