C Bit Fields

/*
-std=c99 -Wall -Wextra -Wpedantic -Wshadow
*/

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>

struct status{
    unsigned int sv1:1;
    unsigned int sv2:1;
    unsigned int sv3:1;
    unsigned int sv4:1;
    unsigned int sv5:1;
    unsigned int sv6:1;
    unsigned int sv7:1;
    unsigned int sv8:1;
    unsigned int sv9:1;
    unsigned int sv10:1;
    unsigned int sv11:1;
    unsigned int sv12:1;
    unsigned int sv13:1;
    unsigned int sv14:1;
    unsigned int sv15:1;
    unsigned int sv16:1;
    unsigned int sv17:1;
    unsigned int sv18:1;
    unsigned int sv19:1;
    unsigned int sv20:1;
    unsigned int sv21:1;
    unsigned int sv22:1;
    unsigned int sv23:1;
    unsigned int sv24:1;
    unsigned int sv25:1;
    unsigned int sv26:1;
    unsigned int sv27:1;
    unsigned int sv28:1;
    unsigned int sv29:1;
    unsigned int sv30:1;
    unsigned int sv31:1;
    unsigned int sv32:1;
};

struct tst {
  unsigned int v1:22;
  unsigned int v2:14;
  unsigned int v3:9;
  unsigned int v4:3;
};

int main (int argc, char **argv){

    struct status Stat;
    struct tst sTst;

    memset(&Stat,0,sizeof(Stat));

    Stat.sv1 = true;
    Stat.sv2 = false;

    printf("sizeof Stat: %zu\n", sizeof(Stat));
    printf("sizeof sTst: %zu\n", sizeof(sTst));
    printf("sizeof int: %zu\n", sizeof(int));

    printf("sv1: ");
    if(Stat.sv1) printf("true");
    else printf("false");
    printf("\nsv2: ");
    if(Stat.sv2) printf("true");
    else printf("false");
    printf("\n");

    sTst.v1 = 123;
    sTst.v2 = 555;
    sTst.v3 = 15;
    sTst.v4 = 7;

    printf("v1: %d\n",sTst.v1);
    printf("v2: %d\n",sTst.v2);
    printf("v3: %d\n",sTst.v3);
    printf("v4: %d\n",sTst.v4);



return 0;
}

/*

output:

sizeof Stat: 4
sizeof sTst: 8
sizeof int: 4
sv1: true
sv2: false
v1: 123
v2: 555
v3: 15
v4: 7

*/