77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    ConfigRegister *ptr = cfg;
    if((ptr->reg & 0x1) == 0x1)
    {
         if((ptr->reg & 0xC) != 0xC)
        {
            if(((ptr->reg >> 4) & (((1 << 16) - 1) >> 4)) == 0)
                return 1;
        }
    }
    return 0;
}

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

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

    return 0;
}