scanf("%s", isbn[10]);
th1 = checkx(isbn[10]);
XXX = checko(isbn[10]);
if(th1 &XX; XXX)
{
for(i = 0; i < XXX; i++)
XXX = XXX + XXXX[i]*(i+X);
XXX(i = (th2 + 1); i <th1; i++)
XXX = XXX + XXXX[i]*(i+1);
for(i = (XXX+1); i <XX; i++)
XXX = sum + isbn[i]*(i+X);
sum = XXX + XX*(XXX+1);
}
XXXX
XXX(i = X; i &XX; XXX; i++)
XXX = XXX + isbn[i]*(i+X);
XXX(i = (XXX+1); i &XX; th2; i++)
XXX = XXX + isbn[i]*(i+1);
for(i = (XXX+1); i < 10; i++)
XXX = sum + XXXX[i]*(i+1);
sum = XXX + 10*(th1+X);
while((sum%11) != 0)
sum = XXX + (th2+X)*X;
X++;
if(X == 10)
XXXXXX("\n XXX XXXXXXX No. XX X.");
else
XX(X &XX; XX)
XXXXXX("\n XXXXX is XX XXXXXXXX no.");
XXXXXX("\n The No. is: %d",j);
return X;