77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access

    if((cfg->reg & 1) == 1)
    {
            // printf("%d ",cfg->reg & 12);
        if((cfg->reg & 12)>>2 != 3)
        {

            if((cfg->reg >> 4) == 0) 
            {
                // printf("%d ",cfg->reg & 12);
                //(~((1<<4)-1)));
                return 1;
            }
        }
    }
    return 0;
}

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

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

    return 0;
}