Hi
say i have a char array of size 19 (meaning 20 characters can be input)
now i got a problem, if i input more then 20 characters it will store them still and be used for my other variables (overflow)
Is there a way to find how many characters a char array is holding?
If you are using it as a string and the size is 19, only 18 characters can be input, since the last char would be the terminating null character.say i have a char array of size 19 (meaning 20 characters can be input)
Unless the array has decayed to a pointer (e.g., you passed it as an argument), sizeof() could be used to find the size.
Look up a C++ Reference and learn How To Ask Questions The Smart WayOriginally Posted by Bjarne Stroustrup (2000-10-14)
oh ok so like this:
char name[20] = abc
if (sizeof(name) > 20)
output error
or is there anyway to say if more than 20 characters have been inputted dont store the rest? how do i prevent the overflow
Last edited by taurus; 09-16-2007 at 12:43 PM.
that will always return 20. you want to use strlen.
Or just don't ask for more than 20?
Code:char name[20]; fgets(name, sizeof(name), stdin);
By the time strlen is applied, it's too late. The key is stopping before you've read too much, as zacs shows.
All the buzzt!
CornedBee
"There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
- Flon's Law
yes and thats what i dont know how to do?
use fgets. see zacs7's post.
Hey taurus
have you finished the psuedocode yet???
oh alright so let me see if i understand this:
the user can enter a name, now his statement checks if its below 20 characters and then if it is stores
OR
does it work by only storing 20 characters and ignore the rest inputed there?
fgets(str, 20, stdin); reads 19 and leaves the rest in the stdin buffer.
unless a newline is read first.
Last edited by robwhit; 09-16-2007 at 09:29 PM.
but say i have more variables after that, it wont write the excess in the buffer to those variables?
only if you read it in with an input function.
and yea theres the problem, i am going to be inputting other things, problem?
