Hi all,
i have the following program
the actual answer is 5. but from my calculation it should be 7 if i consider \0 as null as a single character and one for the last null character. Where i am going wrong somebody please show the concept to me, also if i apply a strlen(str) that also giving me not the expected result. how to decode this?Code:#include <stdio.h> main() { char str[]="S\065AB"; printf("\n%d", sizeof(str)); }
thanks in advance,
regards,
satya
"sizeof" is used to get the size of a data type, not a string. You should indeed use strlen(), which gives you the number of character in the string, excluding the null termination char '\0'.
Also, I'm not sure what you mean by "the last null character". The last character of a well formatted C string is '\0'.
So if you want the size of the string, including the last '\0', you should use "strlen() + 1".
Hope that helps.
I did not notice that you wanted to put \0 in your string directly. You cannot do that. In C string, the '\' character is an escape character. When writing "\065", it means "character with octal value 065" (see : C syntax - Wikipedia, the free encyclopedia).
Last edited by Tibo-88; 02-23-2012 at 07:20 AM.
HomePort : A C Web Service API for heterogeneous home automation systems
great many thanks i understood the concept. actually the question was one of the online problems i was trying to solve.
thanks and regards,
satya
Yes you can use sizeof. It gives the hard-coded size of the object.
str[0] is 'S'
str[1] is '5' (digit '5' from octal 065)
str[2] is 'A'
str[3] is 'B'
str[4] is '\0' (null character)
Even if he did want to embed \0 in the middle of a series of characters, he would still have a string that ended on the first \0 encountered (ignoring the octal thing for a moment). So strlen would have given him 1.Originally Posted by Tibo-88
Quzah.
Hope is the first step on the road to disappointment.
@nonoob : thanks for clarifying. But I might add that I would not advice taking the habit of using sizeof for computing string length, because when you switch to dynamically allocated strings, then it is not true anymore.
@quzah : Yeah I didn't express myself right (once again), thanks also. It will actually only be taken as octal number if three decimals are following the "\".
Last edited by Tibo-88; 02-23-2012 at 01:02 PM.
HomePort : A C Web Service API for heterogeneous home automation systems
