main.cpp

ssd5习题答案源码

#include <iostream>
#include <fstream>
#include <stack>
#include "car.h"

using namespace std;

int main(int argc, char *argv[])
{	 
	ifstream ifs("data.txt");//open file
	if(!ifs){
		cerr<<"Can't open the in file "<<endl;
	 exit(-1);
	}

	ofstream ofs("output.txt");//open file
	if(!ofs){
		cerr<<"Can't open the out file "<<endl;
     exit(-1);
	}

	stack<car *>  stack_;// stack to simulate the park lot
	stack<car *>  temp_stack_;//stack to store the cars been moved in order to make the object out

	car * point_to_car;
	string license_tag;
	string action;// arrives or departs

	while(!ifs.eof()) 
	{
		ifs>>license_tag>>action;
		if(action == "arrives"){// a car arrives
			if(stack_.size() <5){// to check if there is space left
				point_to_car = new car(license_tag);// generate a pointer to the car
				stack_.push(point_to_car);// the pointer enter stack
			}
			else
				ofs<<"Sorry "<<license_tag<<" , the lot is full"<<endl;
		}

		else if(action == "departs")// when a car departs
		{
			while(!stack_.empty()&&stack_.top()->get_license_plate() != license_tag){//the object car is not in the top 
				temp_stack_.push(stack_.top());// enter the temporary stack
				stack_.top()->move();//move times increase
				stack_.pop();//go out the stack
			}

			if(stack_.top()->get_license_plate() == license_tag){// the object car is in the top now
				ofs<<stack_.top()->get_license_plate()<<" was moved "<<stack_.top()->get_move_times()<<" times while it was here"<<endl;
				delete stack_.top();//delete the object
				stack_.pop();// pop the pointer 
			}

			else
				ofs<<"Accident!"<<endl;

			while(!temp_stack_.empty()){//put the cars back from the temporary stack to the stack
				stack_.push(temp_stack_.top());
				temp_stack_.pop();
			}

		}
	}

	for(;!stack_.empty();){//output the number of times each car that remains in the lot (if there are any) was moved
		ofs<<stack_.top()->get_license_plate()<<" moved "<<stack_.top()->get_move_times()<<" times while it was here"<<endl;
		delete stack_.top();
		stack_.pop();
	}
	
	ofs.close();//close file
	ifs.close();

	cout<<"Task finished! The result is in the file output.txt. "<<endl;
	return 1;
}