77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    unsigned short val = cfg -> reg;

    if(val & 1 == 0)
    //printf("1\n");
        return 0;
    unsigned short priority = (val >> 2) & 0x03;
    if(priority == 0x03)
    //printf("2\n");
        return 0;
    if(val & 0xFFF0)
    //printf("3\n");
        return 0;
    return 1;
}

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

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

    return 0;
}