boolean question

[stanlvw]

Given a function definition within a project as such:

void usart_str_write(const char* string)
{
     while (*string)
       Usart_Write(*string++);
}

If string pointer sees anything other than a null, would it return a boolean true within the while loop condition? And is null character equivalent to a boolean false?

Thanks.

[QuantumPete]

yep.

[Salem]

If string is NULL, then anything can happen when you try to dereference it, so I'd make that part of the condition.

> And is null character equivalent to a boolean false?
0, '\0' and NULL are regarded as false in C.
Any other integral value, any other character and any valid pointer are regarded as true.

[stanlvw]

The reason that I'm asking the question is that I initially had *string != '\0'; as part of the condition.

[matsp]

That would do exactly the same thing as the code you have now - no difference in behaviour.

--
Mats