Passing valid string through StrLen()

[misterpogos]

Howdy! I am reviewing for my final and one of the questions states that

StrLen(c);

is not a valid function call when

char c = 'c';

Can someone help me understand why?



Examples of valid function calls in the review are

StrLen(cp); 
StrLen(ca);
StrLen("abc");

when

char *cp = "hello";
char ca[] = "world";

It's my first post here, and I apologize for the sloppy formatting.

[tabstop]

You give the answer in your post title. You should only pass strings to strlen, and c is not a string.

[misterpogos]

You give the answer in your post title. You should only pass strings to strlen, and c is not a string.

I just realized that one character can't be a string...thank you

[msh]

Technically, one character can be a string. It would be a string containing only the null character.

char null_str[] = "";

The reason why your example is not a valid function call is because strlen() takes as its argument a pointer to a string, and string is defined in C as a sequence of character values, terminated by a null character.

[misterpogos]

There you go, that's what I was looking for. Strings are null terminated! Thanks =))))