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Needs help in loop

Posted on 2011-02-19
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Last Modified: 2012-05-11
Hi guys: Can any one plesae help me how to i stop the loop when the value in a char variable named anyletter is anything other than the letter Y (in either upper or lower case).

I try it first but dont know how to stop the loop. Thanks.

#include <iostream>
using namespace std;

int main()
{
      int number = 0;
      char anyletter = ' ';
      do
      {
            cout << number << endl;
            number +=1;
      }      while(number <=100 );
            system("pause");
            return 0;
}

0
Comment
Question by:mustish1
  • 4
  • 3
7 Comments
 
LVL 4

Expert Comment

by:andreizz
ID: 34934492
#include <iostream>
#include <ctype>
using namespace std;

int main()
{
      int number = 0;
      char anyletter = ' ';
      do
      {
            cout << number << endl;
            cout<<"Letter:";cin>>anyletter;
            if(isalpha(anyletter)&&(anyletter!='Y'||anyletter!='y'))
                 break;
            number +=1;
      }      while(number <=100 );
            system("pause");
            return 0;
} 

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you need ctype for the isalpha test, u can remove that if you don't want to check it.
0
 

Author Comment

by:mustish1
ID: 34934501
I am using visual c++ 2010 it gives error on this line
#include <ctype>
0
 
LVL 4

Expert Comment

by:andreizz
ID: 34934515
#include <iostream>
#include <ctype.h>
using namespace std;

int main()
{
      int number = 0;
      char anyletter = ' ';
      do
      {
            cout << number << endl;
            cout<<"Letter:";cin>>anyletter;
            if(isalpha(anyletter)&&(anyletter!='Y'||anyletter!='y'))
                 break;
            number +=1;
      }      while(number <=100 );
            system("pause");
            return 0;
} 

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or

#include <iostream>
using namespace std;

int main()
{
      int number = 0;
      char anyletter = ' ';
      do
      {
            cout << number << endl;
            cout<<"Letter:";cin>>anyletter;
            if(anyletter!='Y'||anyletter!='y')
                 break;
            number +=1;
      }      while(number <=100 );
            system("pause");
            return 0;
} 

Open in new window

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Author Comment

by:mustish1
ID: 34934517
its not showing any thing.

errorcp.jpg
0
 
LVL 4

Expert Comment

by:andreizz
ID: 34934559
#include <iostream>
using namespace std;

int main()
{
      int number = 0;
      char anyletter = ' ';
      do
      {
            cout << number << endl;
            cout<<"Letter:";cin>>anyletter;
            if(anyletter!='Y'&&anyletter!='y')
                 break;
            number +=1;
      }      while(number <=100 );
            system("pause");
            return 0;
} 

Open in new window


sorry, there wasn't the || operator but &&
try this and renember to print numbers you have to input Y or y else it stops.
0
 
LVL 4

Accepted Solution

by:
andreizz earned 500 total points
ID: 34934566
#include <iostream>
using namespace std;

int main()
{
      int number = 0;
      char anyletter = ' ';
      do
      {
            cout << number << endl;
            cout<<"Letter:";cin>>anyletter;
            if(isalpha(anyletter)&&anyletter!='Y'&&anyletter!='y')
                 break;
            number +=1;
      }      while(number <=100 );
            system("pause");
            return 0;
} 

Open in new window


this is final try it.
0
 

Author Closing Comment

by:mustish1
ID: 34934588
Thanks a lot.
0

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