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Post History
I was fooling around with the following C code on my trusty old x86 PC: #include <stdint.h> #include <stdio.h> int main (void) { uint32_t u32 = 0xAABBCCDD; uint8_t* ptr = (u...
#3: Post edited
by
Lundin
·
2021-02-01T15:49:23Z (almost 4 years ago)
What is CPU endianess?
- What is CPU endianness?
#2: Post edited
by
Lundin
·
2021-02-01T15:49:12Z (almost 4 years ago)
#1: Initial revision
by
Lundin
·
2021-02-01T15:30:52Z (almost 4 years ago)
What is CPU endianess?
I was fooling around with the following C code on my trusty old x86 PC:
```c
#include <stdint.h>
#include <stdio.h>
int main (void)
{
uint32_t u32 = 0xAABBCCDD;
uint8_t* ptr = (uint8_t*)&u32;
for(size_t i=0; i<sizeof(uint32_t); i++)
{
printf("%.2X", ptr[i]);
}
}
```
To my surprise, this prints `DDCCBBAA` with all bytes backwards. Someone told me this was because of "endianness" and that my x86 is "little endian". What is the meaning of this?