[英]Debug this c++ program
我需要幫助來調試這個程序。
// VirtualFN.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
#include <conio.h>
#include <string>
#include <iomanip>
using namespace std;
enum isautostart { no,yes };
class vehicle {
protected:
static int noofvehicles;
string vehiclename;
long long int price;
isautostart autostart;
public:
vehicle():price(0),autostart(no),vehiclename("N/A")
{
noofvehicles++;
}
vehicle (vehicle& tempveh){
vehiclename = tempveh.vehiclename;
autostart = tempveh.autostart;
price = tempveh.price;
}
virtual void getdataofvehicle(){
string tempcarname;
char check[15];
cout<< "\nPlease enter the name of vehicle :";
getline(cin,tempcarname);
vehiclename = tempcarname;
/*******************************************************/
while(true){
cout<< "Please enter the price of the car :"; cin>>setw(14)>>check;
if(atoi(check)){
price = atoi(check);
break;}
else{
cout<< "you didn't enter the integer number , Try again"<<endl;
}
}
/*******************************************************/
char bools;
cout <<"Vehicle has autostart function ? : (y/n)"; cin >> bools;
if(bools == 'y'){
autostart = yes;
}
else { autostart = no; }
}
virtual void displaycardata() {
cout<< "\nName of vehicle is :" << vehiclename;
cout<< "\nPrice of the vehicle is : $" <<price;
if(autostart){
cout<< "\nThis vehicle is autostart.";}
else{
cout<< "\nThis vehicle is not autostart.";}
}
static void displaynoofcars(){
cout<<"\nNo of cars in warehouse are :" << noofvehicles;
}
};
int vehicle::noofvehicles = 0;
class mercedez : public vehicle {
string color;
public:
mercedez(): vehicle() {
color = "N/A";}
void getdataofvehicle() {
vehicle::getdataofvehicle();
cout<<"\nPlease enter the color of the car :";
cin >> color;
}
void displaycardata(){
vehicle::displaycardata();
cout<<"\nThe color of the car is:" << color;
}
};
int main()
{
vehicle *v1;
vehicle *v2;
mercedez a;
v1 = new vehicle;
vehicle::displaynoofcars();
v2 = new mercidez;
vehicle::displaynoofcars();
v1->getdataofvehicle();
v1->displaycardata();
v2->getdataofvehicle();
v2->displaycardata();
getch();
return 0;
}
現在當繼承的類mercedez嘗試通過v2-> getdataofvehicle()執行車輛的getdataofvehicle時;
getdataofvehicle函數基類的一部分不接受輸入,只需顯示“請輸入汽車的價格:”並直接跳轉到:cout <<“請輸入汽車的價格:”; CIN >>運輸及工務局局長(14)>>檢查;
任何人都可以調試這個並告訴我為什么會發生這種情況
非常感謝任何幫助
問題可能出在這里:
char bools;
cout <<"Vehicle has autostart function ? : (y/n)"; cin >> bools;
if(bools == 'y'){
autostart = yes;
}
else { autostart = no; }
要使其工作,您需要鍵入“Y <Enter>”以使緩沖區刷新。
但代碼只從輸入流中讀取“Y”。 因此,流仍包含<Enter>字符。 所以你可以輸入第一輛車的數據但是當你到達第二輛車時,仍然有數據留在std :: cin(<Enter>),這是用std :: getline()讀取的,它讀取一個空行。
要解決此問題,請閱讀以下內容:
cout <<"Vehicle has autostart function ? : (y/n)";
std::string bools;
std::getline(std::cin, bools);
autostart = ((bools == "y") || (bools == "Y"))? yes : no;
我給了你一個線索,你應該自己做一些工作(否則你什么都學不到)。
關於<Enter>的相同規則適用於此處。
cout<< "Please enter the price of the car :"; cin>>setw(14)>>check;
PS:不要在一行上放兩個語句。
嘗試這樣的事情:
cout<< "Please enter the price of the car :";
std::string priceData;
std::getline(std::cin, priceData);
// Choice 1: (Best)
price= boost::lexical_cast<long long int>(priceData);
// Choice 2: (OK) Best if you don't have boost;
std::stringstream priceStream(priceData);
priceStream >> price;
// Choice 3: Only if you must use atoi() use it as a last resort.
price = atoi(priceData.c_str());
v2 = new mercidez;
應該
v2 = new mercedez;
對於初學者。
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