Question

How to defind multiple bit fields in C

Answer 1

#include <stdio.h>

struct S 
{
    // a : 3 bits
    // 11 bits unused
    // b : 5 bits
    // c : 2 bits
    // 9 bits unused
    unsigned a : 3, : 13, b : 5, c : 2;
};

int main(void)
{
    printf("%d bytes", sizeof(struct S)); 
        
    return 0;
}

/*
run:
 
4 bytes

*/

 

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