如果某一常量与其它常量密切相关，应在定义中包含这种关系，而不应给出一些孤立的值

如果某一常量与其它常量密切相关，应在定义中包含这种关系，而不应给出一些孤立的值。

例如： const float RADIUS = 100; const float DIAMETER = RADIUS * 2;

#include <iostream>
#include <string>

using namespace std;

//测试字符串(string)对象
/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char** argv) {
        //创建string对象,并显示
    string s1;
    string s2="ABCDEFGHIJK";
    string s3=s2;
    string s4(20,'A');
    string s5(s2,3,3);
    cout<<"s1="<<s1<<endl;
    cout<<"s2="<<s2<<endl;
    cout<<"s3="<<s3<<endl;
    cout<<"s4="<<s4<<endl;
    cout<<"s5="<<s5<<endl;

    //为string对象输入数据,并显示
    cout<<"s1=";
    cin>>s1;
    cout<<"s2=";
    cin>>s2;
    cout<<"s3=";
    cin>>s3;
    cout<<"s4=";
    cin>>s4;
    cout<<"s5=";
    cin>>s5;

    cout<<"s1="<<s1<<endl;
    cout<<"s2="<<s2<<endl;
    cout<<"s3="<<s3<<endl;
    cout<<"s4="<<s4<<endl;
    cout<<"s5="<<s5<<endl;
    
    return 0;
}