我使用 do while 循环制作 c++ 程序，但在插入 y 或 Y 条件后，我得到循环继续的错误，而没有让我再次插入输入
在while ( x =='y'|| x == 'Y');它继续重复之后，我无法插入他的输入，直到我停止程序
#include <iostream>
using namespace std;
int main()
{
char str[30];
char symptom,quest;
char a,b,x,y,Y,n,N;
do{
cout<<" Enter your name: "<<endl;
cin.get(str,30);
cout<<"Hi " << str << ", Welcome to COVID test!"<<endl;
cout<<"Let's start the self testing test!"<<endl<<endl<<endl;
cout<<"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"<<endl;
cout<<" COVID SELF TESTING CENTRE "<<endl;
cout<<"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"<<endl<<endl;
cout<<"Do you have any symptoms below: (1-Yes, 2-No)"<<endl;
cout<<"Fever --> "<<endl;
cin>>a;
cout<<"Cough --> "<<endl;
cin>>a;
cout<<"Flu --> "<<endl;
cin>>a;
cout<<"Shortness of breath --> "<<endl;
cin>>a;
cout<<"Sore throat --> "<<endl;
cin>>a;
cout<<"Have you ever tested POSITIVE COVID-19 : "<<endl;
cin>>b;
cout<<"Do you had close contact with those who have been confirmed PORITIVE COVID-19 in the last 14 days? : "<<endl;
cin>>b;
cout<<"Do you have a history of traveling abroad or outside the state of Perak in the last 14 days? : "<<endl;
cin>>b;
cout<<"Are you currently undergoing a home quarantine control order by the Ministry of Health Malaysia? : "<<endl;
cin>>b;
cout<<endl<<endl;
cout<<"========================================================="<<endl;
cout<<" RESULT FOR COVID-19 SELF TESTING CENTRE "<<endl;
cout<<"========================================================="<<endl;
symptom=a;
quest=b;
if (symptom=='2'&&quest=='2')
{
cout<<"GREEN ZONE. Your status are low risk and no symptoms. Please folllow the SOP and Stay Safe Thank You!"<<endl;
}
if (symptom=='1'&&quest=='1')
{
cout<<"RED ZONE. Please get a clinically COVID-19 checkup from nearby hospital. Please folllow the SOP and Stay Safe Thank You!"<<endl;
}
if (symptom=='1'&&quest=='2')
{
cout<<"YELLOW ZONE. Please stay at home or self quarantine. Please folllow the SOP and Stay Safe Thank You!"<<endl;
}
if (symptom=='2'&&quest=='1')
{
cout<<"YELLOW ZONE. Please stay at home or self quarantine. Please folllow the SOP and Stay Safe Thank You!"<<endl;
}
cout<<"Ingin teruskan? (Y-yes, N-No): "<<endl;
cin>>x;
cout<<" ";
}while ( x =='y'|| x == 'Y');
system("pause");
return 0;
}
您看到的问题是 cin 缓冲区中有剩余的字符，因此下次通过循环时，它会读取这些字符并且不会要求用户输入。如果您在循环结束时清除缓冲区，则后续运行将起作用。
do {
//...
std::cout << "Ingin teruskan? (Y-yes, N-No): "<< std::endl;
std::cin >> x;
std::cout << " ";
// add this to ignore and clear the current cin buffer
std::cin.clear();
std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
} while (x == 'y' || x == 'Y');
请查看此问题以了解更多相关细节。
您可能还需要添加#include <limits>以使用numeric_limits（尽管在我的情况下 iostream 将其拉入，因此我不需要添加该包含）。
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