Using bit fields

struct structName {
    unsigned int memberName1: bitWidth;
    ...
    unsigned int memberNamen: bitWidth;
}

// bit field struct may be celared normally or as a typedef
typedef struct {
    unsigned int x:10;
    unsigned int y:20;
} myBits;

struct myByteBits {
    unsigned int volts: 1;
    unsigned int amps: 1;
    unsigned int ohm: 1;
    unsigned int humid: 3;
    unsigned int temp: 2;
} a;

int main (void) {
    a.volts = 1;    //may contain values from 0 to 1
    a.amps  = 0;    //may contain values from 0 to 1
    a.ohm   = 0;    //may contain values from 0 to 1
    a.humid = 0b10; //may contain values from 0 to 7
    a.temp  = 0x0;  //may contain values from 0 to 3
}