See Boss,
1st know what is ENDIAN.
It tells about way of storage of of values occupying greater than 1 byte.
2 types of endian ness are there :
1. LITTLE ENDIAN
2. BIG ENDIAN
In LITTLE ENDIAN the "Lower" byte is stored at Lower memory location, and
Higher byte is stored at higher memory location
In BIG ENDIAN the Higher byte is stored at Lower memory location and vice-versa.
Now what you are facing is that the lower byte is stored at Lower memory
location and vice versa, which is the case of Little endian ness.
Here you are entering the value 0x01 at lower location(y[0]) and 0x15( 0d21 )
at higher memory (y[1])location.Then you are getting the output as
0x1501(0d5377)..... implicating LITTLE ENDIANESS
Isnt it simple ??
Karmennevaya Dhikaraste, Maaphaaleshu Kadaachanah
----- Original Message ----
From: Anup Joshi <[EMAIL PROTECTED]>
To: [email protected]
Sent: Saturday, 4 August, 2007 10:49:41 PM
Subject: Re: [c-prog] 2 8bit to 1 16bit variable
thank you all of you for your responses but i still cant get one thing, i was
successfully able to compile my recent code on gcc v3.42 also, here is the code
again:
=====
#include <stdio.h>
union vals {
unsigned short x;
unsigned char y[2];
} myvals;
int main() {
myvals.y[0] = 1; //lsb
myvals.y[1] = 21; //msb
printf("%d", myvals.x);
printf("\n %d", sizeof(myvals) );
}
compiled using command: gcc union.c -o myunion.exe
====
and output again is
5377
2
=====
so according to Vic i havent solved the endian problem but i cant understand
where the problem actually is in this code ???
second thing is the sizeof union shows up to be 2 but i was expecting it to be
3 (i thought the array is of 3 bytes though it may contain only two elements)
because i changed the array from uchar y[1](sizeof gave 2) to uchar y[2](size 2
again)!!!! why does this happen???
and now if union is the feature of c itself why cant i use it to solve brians
problem???
my questions might be silly becoz im a newbie hence i have turned up to you
gurus for clarifying my doubts. thanks for patiently responding me
with regards
anup
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