Decode ADC Result Using Union Bitfields

Code

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

// ADC_result
typedef union {
    struct {
        uint16_t adc_val : 12; 
        uint8_t adc_ch : 4; 
    } bytes; 
    uint16_t reg; 
} adc_res; 

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

    // Fill union and print channel and adc_value
    adc_res adc;
    adc.reg = reg; 
    printf("Channel: %u\n", adc.bytes.adc_ch);
    printf("ADC Value: %u", adc.bytes.adc_val);

    return 0;
}

Solving Approach