77. Validate Configuration Register Layout

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

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    uint8_t enable = cfg->reg & 0x1;
    uint8_t priority = cfg->reg & 0xC;
    uint16_t reserved = cfg->reg & 0xFFF0;
    if(enable && priority!=3 && reserved==0)
        return 1; 
    return 0;
}

int main() {
    ConfigRegister cfg;
    scanf("%hx", &cfg.reg);

    int result = validate_config(&cfg);
    printf("%d", result);

    return 0;
}