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 << 0)) && (( (cfg->reg >> 2) & 0x03) != 3) 
    )
    {
        if ((cfg->reg >> 4 ) & 0xff) {
            return 0;
        } 
        else 
        {
            return 1;
        }

    }
    return 0;
}

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

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

    return 0;
}