Question

How to extract bytes from hexadecimal value in C

Answer 1

#include <stdio.h>
 
int main()
{
    unsigned int n = 0x99A077FF; 
     
    unsigned char a, b, c, d; 
     
    a = (n & 0xFF); 
    b = ((n >> 8) & 0xFF); 
    c = ((n >> 16) & 0xFF); 
    d = ((n >> 24) & 0xFF); 
 
    printf("a = %02X\n", a);
    printf("b = %02X\n", b);
    printf("c = %02X\n", c);
    printf("d = %02X\n", d);
}
  
/*
 
run:
 
a = FF
b = 77
c = A0
d = 99
 
*/

 

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