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
//     return 0;
// }


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);// Read hexadecimal input

    ADC_Result adc;
    adc.adc_reg = reg;

    printf("Channel: %u\n",adc.channel);
    printf("ADC Value: %u",adc.adc_value);
    return 0;
}

Solving Approach