c++ 类与对象应用题

#include
using namespace std;
class tank
{
    private:
        int F;
        int vin;
        int vout;
        int gravity;
    public:
        tank():F(0),vin(0),vout(0),gravity(0){    }
        ~tank(){
		};
        void set(int f,int in,int out)
        {
            F=f;
            vin=in;
            vout=out;
        }
        int getin(int t0,int te)
        {
            gravity+=(te-t0)*vin;
            return gravity;
        }
        int getout(int t0,int te)
        {
            gravity-=(te-t0)*vout;
            if(gravity<=0)
            {
                gravity=0;
            }
               return gravity;
        }
        int getresult()
        {
            if(gravity

#include
using namespace std;
class CFruit_stand
{
	public:
		CFruit_stand();
		~CFruit_stand();
		double weight;
		double price;
		void charge(char*,double);
		void print();
};
CFruit_stand::CFruit_stand()
{
	weight=0;
	price=0;
}
CFruit_stand::~CFruit_stand()
{
	
} 
void CFruit_stand::charge(char *p,double money)
{
	while(*p!='\0')
	{
		if(*p=='A')
		{
			weight+=0.1;
			price+=0.1*10;
		}
		else if(*p=='B')
		{
			weight+=0.1;
			price+=0.1*12;
		}
		else if(*p=='C')
		{
			weight+=0.05;
			price=0.05*14;
		}
		else if(*p=='D')
		{
			weight+=0.4;
			price+=0.4*16;
		}
		p++;
	}
	cout<<"收顾客钱"<