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;

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

    // Fill union and print channel and adc_value
    ADC_Result res;
    res.adc_reg = reg;
    printf("Channel: %d\nADC Value: %d", (res.adc_reg & 0xF000) >> 12, res.adc_reg & 0xFFF);

    return 0;
}