继续输入(Y/N)控制语句的问题

[priestmoon]

不知为何,下面的代码似乎不能实现 "继续输入?(Y/N)"的功能。
哪位能分析一下错误原因，并作出适当的修改？

#include <iostream>
using namespace std;

int main()
{
int i,j,sum;
cout<<"Please input two numbers: ";
cin>>i>>j;
sum=i+j;
cout<<i<<" "<<j<<" "<<sum<<endl;
//to display integer i,j and i+j

while(true)
{
cout<<"continue?(Y/N) :"; //press 'Y' if being to continue input.
//otherwise, jump out.
if( !(getchar()=='Y'&&getchar()=='y') )
//There seems to be something wrong with the line above.
break;
cout<<"Please input two numbers: ";
cin>>i>>j;
sum=i+j;
cout<<i<<" "<<j<<" "<<sum<<endl;
}

return 0;
}

[pengzhixi]

改成do....while 试试

#include  <iostream> 
using namespace std; 

int main() 
{ 
  int i,j,sum; 
  do{
    cout < <"Please input two numbers: "; 
    cin>>i>>j; 
    sum=i+j; 
    cout < <i < <" " < <j < <" " < <sum < <endl; 
    char continue;
    cout < <"continue?(Y/N) :";
    cin>>continue;
    }while(continue=='y'||continue=='Y')
  } 

  return 0; 
}

[lifelovers]

是输入输出的那个符号，模拟搞错了一些，C++明确要求是“<<”或是“>>”,你的有些有空格空开了

[hyram]

把你的＆＆改成｜｜否则就是永假式

[waterfield]

逻辑没有分析清楚。

[priestmoon]

按照各位的意见改了一下,但好象还是不行...

#include  <iostream> 
using namespace std; 

int main() 
{ 
  int i,j,sum; 
  cout<<"Please input two numbers: "; 
  cin>>i>>j; 
  sum=i+j; 
  cout<<i<<" "<<j<<" " <<sum <<endl; 

  while(true) 
  { 
    cout<<"continue?(Y/N) :";  //press 'Y' if being to continue input. 
    char ch=getchar();
    if( !(ch=='Y' || ch=='y') ) 
      break; 
    cout<<"Please input two numbers: "; 
    cin>>i>>j; 
    sum=i+j; 
    cout<<i<<" "<<j<<" "<<sum<<endl; 
  } 
  
  //system("pause");
  return 0; 
} 

[limingjiu]

if( !(getchar()=='Y'&&getchar()=='y') )
//There seems to be something wrong with the line above.
break;
一个字符不能同时为'Y'和'y'

[pengzhixi]

改成do while 不行？

[pengzhixi]

[Quote=引用 1 楼 pengzhixi 的回复:]
改成do....while 试试

C/C++ code
#include <iostream>
using namespace std;

int main()
{
int i,j,sum;
do{
cout < <"Please input two numbers: ";
cin>>i>>j;
sum=i+j;
cout < <i < <" " < <j < <" " < <sum < <endl;
char ch;
cout < <"ch?(Y/N) :";
cin>>continue;
}while(ch=='y'||ch=='Y')
}

return 0;
}
[/Quote]
犯了低级错误，把continue用做变量名了

[MaybeDevil]

//Test.cpp
#include <iostream>

using std::cout;
using std::cin;
using std::endl;

int main()
{
int i,j,sum;
cout < <"Please input two numbers: "; // show
char ch = 0;

do {

cin>>i>>j;
sum=i+j;
cout < <i < <" " < <j < <" " < <sum < <endl;
//to display integer i,j and i+j
cout << "Do you want to contimue?(y/n)" << endl; // get the result
cin >> ch; // get the entering
cout << endl;
}while(ch == 'y' || ch == 'Y') // check the result ,if equals 'y'and'Y',break ,and continue the next return 0


return 0;
}

[zsxcn]

if( !(getchar()=='Y'&&getchar()=='y') )应该改成
if( !(getchar()=='Y'||getchar()=='y') )

[zsxcn]

if( !(getchar()=='Y'&&getchar()=='y') )应该改成
if( !(getchar()=='Y' || brvbargetchar()=='y') )

[priestmoon]

哪位能解释一下错误原因?