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;
    };
    uint16_t adc_reg;
} ADC_Result;

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

    // Fill union and print channel and adc_value

    // Initialize a variable adc of type union (ADC_Result)
    ADC_Result adc;

    // Set value of adc_reg as reg:
    adc.adc_reg = reg;

    printf("Channel: %d\nADC Value: %d", adc.channel, adc.adc_value);

    return 0;
}

Solving Approach