Your program will ask the user to enter an ISBN number, and verify that the user

Question

Your program will ask the user to enter an ISBN number, and verify that the user entered 9 digits. If input was invalid, prompt the user to try again. Print the complete ISBN with check symbol. Note that the ISBN should be printed with a hyphen after the first and fourth digit, and before the check symbol.

Use a string method to properly format the ISBN before printing.

Use bool validateinput(string abc){ to validate the user input,

use char getCheckSum(string xyz){ for a loop to scan each digit of the ISBN
Allow the user to continue entering ISBNs until they indicate they want to quit.                       ==================Exp. Output=================================

Enter 9-digit ISBN: 123456789
Full ISBN with check symbol: 1-234-56789-X
Again [Y/N]?y
Enter 9-digit ISBN: hello
Enter 9-digit ISBN: 12345
Enter 9-digit ISBN: 098765432
Full ISBN with check symbol: 0-987-65432-2
Again [Y/N]?y

--------------------------------------------------------------------------------------------------------

# include <iostream>

# include <ctime>

# include < string>

validateinput(string abc)

char getCheckSum(string xyz)

int main()

{

int isbn;

bool isValid;

string isbn;

cout<< "Enter 9-digit ISBN: " ;

cin >> isbn;

     while( !isValid);

         cout << " Enter 9-digit ISBN: ";

         cin >> isbn;

Explanation / Answer

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# include <iostream>
# include <ctime>
# include <string>
using namespace std;
bool validateinput(string abc);
char getCheckSum(string xyz);
string format(string,char);
int main()
{char c;
string isbn;
do
{cout<< "Enter 9-digit ISBN: " ;
cin >> isbn;
while(!validateinput(isbn))
     {cout << "Enter 9-digit ISBN: ";
      cin >> isbn;
      }
c=getCheckSum(isbn);
cout<<"Full ISBN with check symbol: "<<format(isbn,c)<<endl;
cout<<"Again [Y/N]? ";
cin>>c;
cin.clear();
cin.ignore(80,' ');
}while(toupper(c)=='Y');
return 0;
}
bool validateinput(string abc)
{int i=0;
while(abc[i]!='')
     {if(!isdigit(abc[i]))
          return false;
      i++;
     }

if(i==9)
    return true;
return false;
}
char getCheckSum(string xyz)
{int i,weight=10,sum=0,n;
char c;
for(i=0;i<9;i++)
    { sum=sum+weight*(xyz[i]-'0');
    weight--;
     }
    n=sum%11;
    n=11-n;
    if(n==10)
         c='X';
    else
         c=n+'0';
return c;
}
string format(string isbn,char c)
{string out="";
int i;
for(i=0;i<9;i++)
    {out=out+isbn[i];
    if(i==0||i==3||i==8)
          out=out+'-';
     }
out=out+c;
out=out+'';
return out;
       
             
       }

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