Exception Handling

CaptainP

Hi all,

I am writing a c++ program that involves exception handling.I am reading in a int value from the user.How can i make sure that they are not inputting a character value.

I have tried checking this value with the isdigit predefined function ctype.h library.IE if the value is not a digit i throw an exception

Code:
if(!isdigit(y))
{
throw " Sorry you have entered a character.This is not allowed!!";
}

catch (char *str)
{
cout << endl<< "Exception: " << str << endl<<endl;
cout<<"Please try again the Program again!"<<endl;
exit(0);
}

where y is the integer value entered by the user.

Any help with this would be greatly appreciated,
Thanks,
Captain P

rsynnott

the exception will only be caught if it's thrown within a try block.

So something like this:

try{
doDangerousThing(); // Throws an exception
doSomethingElse();
}catch(char *str)
{
cout << endl<< "Exception: " << str << endl<<endl;
cout<<"Please try again the Program again!"<<endl;
exit(0);
}

If it's anything complicated, you might want to consider creating your own Exception objects, so you can quickly see what's going wrong and handle it accordingly.