作出决策之if控制结构（2）

/*1.简单的if-else控制结构
2.条件运算符"?:"*/
#include<cmath>
#include<iostream>
#include<iomanip>
usingnamespace std;
int main()
{
        double revenue=0,expenses=0,profit=0,loss=0,interest=0;
        cout<<setprecision(2)<<setiosflags(ios::showpoint);
        cout<<"Enter the company's revenue and expenses:"<<endl;
        cin>>revenue>>expenses;
        cout<<endl<<endl;

        if(revenue>expenses)
        {
                profit=revenue-expenses;
                cout<<"The company is profitable.\n"
                        <<"The company'profit for this month"
                        "is:$"<<profit<<endl;
        }
        else
        {
                loss=expenses-revenue;
                cout<<"The company is running a loss.\n"
                        <<"The company's loss for this month"
                        "is:$"<<loss<<endl;
        }//if-else控制结构。
        interest=(loss>0.0)?(0.05*loss):(0.0);//?：的关系表达式。
        cout<<"The interest the company owes on its debt is $"
                <<interest<<endl;
}
/*简单的if-else控制结构：
  if(expression)
  {
  executable statement 1a;
  executable statement 1b;
  ......
  }
  else
  {
  executable statement 2a;
  executable statement 2b;
  ......
  }
  注意：如果if语句后面有不止一条语句，就得用花括号，具体以分号作为基准。*/