71. Decode ADC Result Using Union Bitfields

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

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

void extract_and_print(uint16_t reg){
    ADC_Result adc = {
        .adc_reg = reg
    };

    printf("Channel: %u\n", adc.channel);
    printf("ADC Value: %u\n", adc.adc_value);
}

int main() {
    uint16_t reg;
    scanf("%hx", &reg);

    // Fill union and print channel and adc_value
    extract_and_print(reg);
    return 0;
}