Question

How to create struct with 8 bit fields in C

Answer 1

#include <stdio.h>

struct test {
    unsigned int x1 : 8;
    unsigned int x2 : 8;
    unsigned int x3 : 8;
    unsigned int x4 : 8;
};  

void work() {
  struct test data;
  
  data.x1 = 0;
  data.x2 = 0;
  data.x3 = 0;
  data.x4 = 0;
  
  data.x1++;
  data.x2 += 2;
  data.x3 += 3;
  data.x4 += 4;
  
  printf("%i %i %i %i", data.x1, data.x2, data.x3, data.x4);
}

int main(void) {
    printf("size = %zu\n", sizeof(struct test));
    
    work();
}




/*
run:

size = 4
1 2 3 4

*/

 

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