77. Validate Configuration Register Layout

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


typedef union {
    uint16_t reg;              
    struct {                   
        uint16_t Enable   : 1; // Bit 0
        uint16_t Mode     : 1; // Bit 1
        uint16_t Priority : 2; // Bit 2-3
        uint16_t Reserved : 12;// Bit 4-15
    } bits;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    if (cfg->bits.Enable == 1 &&  (cfg->bits.Priority) !=3  && cfg->bits.Reserved == 0) {
        return 1;
    }
    return 0;
}

int main() {
    ConfigRegister cfg;
    
  
    if (scanf("%hx", &cfg.reg) == 1) {
        int result = validate_config(&cfg);
        printf("%d", result);
    }

    return 0;
}