Extracting bytes in C

Question

I\'m making a program in C. I am to extract bytes. un8 extractbyte (int r, int pos) should return byte number pos from number r. As example, I use as input: <

Answer 1

I would make your extractbyte function something like this.

int extractbyte(int n, int pos)
{
    return (n >> (pos * 8)) & 0xff;
}

Answer 2

un8 extractbyte(un32 r, un8 pos)
{
    return (r >> (8 * pos)) & 0xFF;
}

Answer 3

#include <stdio.h>

char extractbyte(int number, int v) {
    char *x=(char *)&number;
    return x[3-v];
}

int main() {

    int n=0x7788aabb;
    int i;
    for (i=0; i<4; i++) {
        printf("%d) %x\n",i,(unsigned char)extractbyte(n,i));
    }
    return 0;
}