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_flag = (uint8_t)(cfg->reg && 0b01);
    uint8_t priority = (uint8_t)((cfg->reg && 0b1100)>>2);
    uint8_t reserved = (uint8_t)(cfg->reg >>4);

    if (enable_flag==0){return 0;}
    if (priority==3){return 0;}
    if (reserved!=0){return 0;}
    
    return 1;
}

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

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

    return 0;
}