Validate Configuration Register Layout

Code

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    
    unsigned short val = cfg->reg;

    if((val & 0x0001) == 0)
        return 0;

    unsigned short priority = (val >> 2) & 0x03;;
    if(priority == 0x03)
        return 0;
    
    if((val & 0xFFF0) != 0)
        return 0;

    return 1;
}

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

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

    return 0;
}

Solving Approach