Decode ADC Result Using Union Bitfields

Code

#include <stdio.h>
#include <stdint.h>

typedef union {
    struct {
        uint16_t adc_value : 12;
        uint16_t channel   : 4;
    }bits;
    uint16_t adc_reg;
} ADC_Result;

#define ADC_REAL(reg) {\
            ADC_Result adc;\
            adc.adc_reg = reg;\
            printf("Channel: %d\n", adc.bits.channel);\
            printf("ADC Value: %d\n", adc.bits.adc_value);\
        }

int main() {
    uint16_t reg;
    scanf("%hx", &reg);
    ADC_REAL(reg);
    // Fill union and print channel and adc_value
    return 0;
}

Solving Approach