我的程序内容对于这个问题无关紧要,但我们几乎都在使用类和对象来保存信息。我的代码如下:
#include <iostream>
using namespace std;
class Car
{
private:
int carNumber;
bool loaded;
string reportingMark, kind, destination;
public:
void setUp(string reportingMark, int carNumber, string kind, bool
loaded, string destination);
void output();
};
void input(string &reportingMark, int &carNumber, string &kind, bool
&loaded, string &destination);
/* ******************** main ********************
*/
int main()
{
Car *ptr;
string reportingMark, kind, destination;
int carNumber;
bool loaded;
Car c = *new Car();
ptr = &c;
input(reportingMark, carNumber, kind, loaded, destination);
ptr->setUp(reportingMark, carNumber, kind, loaded, destination);
ptr->output();
return 0;
}
/* ******************** Member Functions ********************
*/
/* ******************** setUp ********************
Takes 5 parameters by value: reporting mark, car number, kind, loaded,
and destination
Inputs these paramaters into the Car class' variables
*/
void Car::setUp(string rm, int cn, string k, bool l, string d)
{
reportingMark = rm, carNumber = cn, kind = k, loaded = l,
destination = d;
}
/* ******************** output ********************
Prints the reporting mark, car number, kind, loaded, and destination
in a neat format
*/
void Car::output()
{
cout << "\n\nReporting Mark: " << reportingMark << "\nCar Number: "
<< carNumber << "\nKind: " << kind << "\nCar is loaded: " << loaded <<
"\Destination: " << destination << endl;
}
/* ******************** Global Functions ********************
*/
/* ******************** input ********************
Takes the reporting mark, car number, kind, loaded, and destination as
reference parameters
Asks the user to input these values
*/
void input(string &reportingMark, int &carNumber, string &kind, bool
&loaded, string &destination)
{
do
{
cout << "What is the Reporting Mark? (Between 2-4 characters) ";
getline(cin, reportingMark);
if(reportingMark.length() < 2 || reportingMark.length() > 4) cout << "invalid input, try again\n";
} while(reportingMark.length() < 2 || reportingMark.length() > 4);
cout << "What is the Car Number? ";
cin >> carNumber;
int carNumResponse;
do
{
cout << "What is the Kind? (Choose '1' for business, '2' for maintenance, or '3' for other) ";
cin >> carNumResponse;
if(carNumResponse < 1 || carNumResponse > 3) cout << "invalid input, try again\n";
} while(carNumResponse < 1 || carNumResponse > 3);
if(carNumResponse == 1) kind = "business";
if(carNumResponse == 2) kind = "maintenance";
if(carNumResponse == 3) kind = "other";
int loadedResponse;
do
{
cout << "Is the car loaded? (Type '1' if true and '2' if false) ";
cin >> loadedResponse;
if(loadedResponse < 1 || loadedResponse > 2) cout << "invalid input, try again\n";
} while(loadedResponse < 1 || loadedResponse > 2);
if(loadedResponse == 1) loaded = true;
if(loadedResponse == 2) loaded = false;
cout << "What is the Destination? ";
getline(cin, destination);
}
我的计划的最后两行:
cout << "What is the Destination? ";
getline(cin, destination);
不让我因某种原因输入任何内容。我错误地使用了getline吗?它在程序的其他部分使用相同的方式。感谢任何有帮助的人!
答案 0 :(得分:0)
这里的问题是您在执行cin>>
操作之前有getline
。 cin>>
所做的是它从流中提取所有字符,但留下了新行字符。
对于getline,默认分隔符是换行符。因此它会跳过输入,因为它会收到流中留下的换行符。
解决方案,您必须执行cin.ignore ()
,这将刷新流,即删除换行符。我建议您在使用cin.ignore ()
功能之前执行getline()
。